Recorded price history USD Listing start period All years 5 years 1 year
Recorded US-dollar price history Linear price scale. Horizontal axis: listing start date. Vertical axis: recorded price in US dollars. Filled dots have recorded sales; open dots have no recorded sales. The oxide step line shows calendar-month medians, with gaps for missing months. 0.00 200.00 400.00 600.00 800.00 Mar 2017 Jul 2019 Dec 2021 May 2024 Oct 2026 2017-03-26: US$62.89; no sale recorded 2017-04-24: US$63.90; no sale recorded 2017-05-09: US$60.14; no sale recorded 2017-05-15: US$42.96; no sale recorded 2017-07-19: US$40.05; no sale recorded 2017-09-26: US$59.43; no sale recorded 2017-11-21: US$43.83; no sale recorded 2018-01-25: US$43.81; no sale recorded 2018-02-23: US$59.43; no sale recorded 2018-05-16: US$240.87; no sale recorded 2018-07-05: US$44.04; no sale recorded 2019-01-11: US$42.92; no sale recorded 2019-09-27: US$230.77; no sale recorded 2019-10-22: US$65.03; no sale recorded 2019-11-23: US$57.00; no sale recorded 2019-11-29: US$104.23; no sale recorded 2019-12-12: US$104.23; no sale recorded 2020-02-11: US$42.11; no sale recorded 2020-02-21: US$68.64; no sale recorded 2020-03-24: US$104.22; no sale recorded 2020-03-24: US$104.22; no sale recorded 2020-07-07: US$42.56; no sale recorded 2020-07-15: US$85.00; no sale recorded 2020-09-22: US$58.00; no sale recorded 2020-10-02: US$44.99; no sale recorded 2020-10-10: US$58.00; no sale recorded 2021-04-13: US$88.20; no sale recorded 2021-04-20: US$46.12; no sale recorded 2021-04-21: US$90.00; no sale recorded 2022-04-26: US$43.39; no sale recorded 2022-05-17: US$77.62; no sale recorded 2022-06-01: US$130.40; no sale recorded 2022-08-01: US$196.24; sold recorded 2022-08-02: US$132.27; no sale recorded 2022-08-23: US$200.00; sold recorded 2022-08-29: US$117.48; sold recorded 2022-09-04: US$39.20; no sale recorded 2022-09-16: US$43.39; no sale recorded 2022-10-06: US$118.00; no sale recorded 2023-02-13: US$240.00; no sale recorded 2023-03-27: US$75.00; no sale recorded 2023-03-29: US$204.60; no sale recorded 2023-04-19: US$110.00; no sale recorded 2023-08-30: US$43.88; no sale recorded 2023-09-04: US$39.20; no sale recorded 2023-09-27: US$42.00; no sale recorded 2023-10-20: US$42.00; no sale recorded 2023-10-27: US$40.75; no sale recorded 2023-12-25: US$69.90; no sale recorded 2024-01-23: US$105.90; no sale recorded 2024-03-12: US$181.00; no sale recorded 2024-04-11: US$199.00; no sale recorded 2024-04-19: US$149.00; sold recorded 2024-04-22: US$41.95; no sale recorded 2024-05-09: US$235.99; sold recorded 2024-05-11: US$188.00; no sale recorded 2024-05-11: US$200.00; no sale recorded 2024-05-15: US$70.99; no sale recorded 2024-05-31: US$228.86; no sale recorded 2024-07-03: US$243.00; no sale recorded 2024-07-09: US$134.32; no sale recorded 2024-07-09: US$9.99; no sale recorded 2024-07-09: US$10.00; no sale recorded 2024-07-11: US$208.68; sold recorded 2024-07-12: US$146.00; sold recorded 2024-08-10: US$33.94; sold recorded 2024-08-27: US$35.73; no sale recorded 2024-08-29: US$72.39; no sale recorded 2024-09-19: US$65.71; sold recorded 2024-09-20: US$225.00; no sale recorded 2024-10-17: US$38.96; no sale recorded 2024-10-24: US$162.17; sold recorded 2024-11-15: US$79.21; no sale recorded 2024-12-16: US$41.74; no sale recorded 2024-12-20: US$158.35; no sale recorded 2024-12-27: US$399.46; no sale recorded 2024-12-30: US$112.65; sold recorded 2025-01-27: US$97.28; no sale recorded 2025-02-10: US$116.00; no sale recorded 2025-02-11: US$128.00; sold recorded 2025-02-26: US$117.00; no sale recorded 2025-03-11: US$78.75; no sale recorded 2025-03-13: US$33.99; no sale recorded 2025-03-18: US$161.50; no sale recorded 2025-03-26: US$37.99; no sale recorded 2025-04-08: US$123.00; no sale recorded 2025-04-11: US$55.00; no sale recorded 2025-04-16: US$41.75; no sale recorded 2025-05-13: US$33.75; no sale recorded 2025-05-24: US$129.27; no sale recorded 2025-05-26: US$71.00; no sale recorded 2025-05-29: US$89.79; no sale recorded 2025-06-09: US$57.56; no sale recorded 2025-06-12: US$55.00; no sale recorded 2025-06-12: US$103.24; no sale recorded 2025-06-18: US$41.75; no sale recorded 2025-07-03: US$132.96; no sale recorded 2025-07-04: US$128.53; no sale recorded 2025-07-04: US$128.64; no sale recorded 2025-07-04: US$129.09; no sale recorded 2025-07-09: US$34.00; no sale recorded 2025-07-14: US$68.00; no sale recorded 2025-07-17: US$172.47; no sale recorded 2025-07-18: US$69.99; no sale recorded 2025-07-18: US$172.41; no sale recorded 2025-07-23: US$130.20; no sale recorded 2025-08-01: US$50.00; no sale recorded 2025-08-04: US$117.00; no sale recorded 2025-08-11: US$96.03; no sale recorded 2025-08-13: US$93.24; no sale recorded 2025-08-14: US$113.24; no sale recorded 2025-08-15: US$32.00; no sale recorded 2025-08-16: US$121.10; no sale recorded 2025-08-18: US$29.90; no sale recorded 2025-08-20: US$33.89; no sale recorded 2025-08-25: US$69.99; no sale recorded 2025-08-25: US$66.72; no sale recorded 2025-08-25: US$66.61; no sale recorded 2025-08-25: US$66.39; no sale recorded 2025-08-25: US$66.06; no sale recorded 2025-08-25: US$65.95; no sale recorded 2025-08-25: US$66.80; no sale recorded 2025-08-25: US$66.92; no sale recorded 2025-09-04: US$34.10; no sale recorded 2025-09-06: US$128.24; no sale recorded 2025-09-10: US$41.73; no sale recorded 2025-09-11: US$41.73; no sale recorded 2025-09-11: US$41.73; no sale recorded 2025-09-13: US$76.85; no sale recorded 2025-09-13: US$76.73; no sale recorded 2025-09-13: US$41.74; no sale recorded 2025-09-13: US$76.62; no sale recorded 2025-09-13: US$41.74; no sale recorded 2025-09-13: US$41.74; no sale recorded 2025-09-13: US$41.74; no sale recorded 2025-09-13: US$41.74; no sale recorded 2025-09-13: US$41.74; no sale recorded 2025-09-13: US$41.74; no sale recorded 2025-09-13: US$41.74; no sale recorded 2025-09-13: US$41.74; no sale recorded 2025-09-13: US$41.74; no sale recorded 2025-09-13: US$41.74; no sale recorded 2025-09-14: US$41.74; no sale recorded 2025-09-15: US$41.74; no sale recorded 2025-09-15: US$41.74; no sale recorded 2025-09-15: US$41.74; no sale recorded 2025-09-15: US$41.74; no sale recorded 2025-09-16: US$41.74; no sale recorded 2025-09-17: US$41.74; no sale recorded 2025-09-18: US$63.02; no sale recorded 2025-09-18: US$41.74; no sale recorded 2025-09-18: US$41.74; no sale recorded 2025-09-18: US$41.74; no sale recorded 2025-09-19: US$134.20; no sale recorded 2025-09-22: US$98.00; no sale recorded 2025-09-30: US$81.93; no sale recorded 2025-10-03: US$133.21; no sale recorded 2025-10-07: US$59.93; no sale recorded 2025-10-07: US$39.89; no sale recorded 2025-10-11: US$533.96; no sale recorded 2025-10-11: US$32.29; no sale recorded 2025-10-16: US$31.15; no sale recorded 2025-10-18: US$32.12; no sale recorded 2025-10-21: US$125.66; no sale recorded 2025-10-28: US$43.77; no sale recorded 2025-11-05: US$150.79; no sale recorded 2025-11-06: US$33.50; no sale recorded 2025-11-20: US$68.99; no sale recorded 2025-12-04: US$30.21; no sale recorded 2025-12-04: US$30.21; no sale recorded 2025-12-06: US$109.75; no sale recorded 2025-12-07: US$116.93; no sale recorded 2025-12-07: US$151.45; no sale recorded 2025-12-07: US$115.53; no sale recorded 2025-12-08: US$122.53; no sale recorded 2025-12-12: US$66.00; no sale recorded 2025-12-17: US$45.16; no sale recorded 2025-12-17: US$115.00; no sale recorded 2025-12-23: US$130.20; no sale recorded 2025-12-25: US$27.89; no sale recorded 2025-12-26: US$62.92; no sale recorded 2026-01-12: US$66.49; no sale recorded 2026-01-12: US$66.11; no sale recorded 2026-01-12: US$66.49; no sale recorded 2026-01-12: US$66.25; no sale recorded 2026-01-14: US$146.00; no sale recorded 2026-01-16: US$88.24; no sale recorded 2026-01-23: US$130.20; no sale recorded 2026-02-06: US$91.64; no sale recorded 2026-03-03: US$51.29; no sale recorded 2026-03-10: US$113.24; no sale recorded 2026-03-28: US$30.20; no sale recorded 2026-04-02: US$115.30; no sale recorded 2026-04-17: US$33.50; no sale recorded 2026-04-23: US$131.86; no sale recorded 2026-04-23: US$132.86; no sale recorded 2026-04-23: US$133.86; no sale recorded 2026-04-23: US$130.20; no sale recorded 2026-04-24: US$46.55; no sale recorded 2026-04-24: US$41.75; no sale recorded 2026-04-24: US$43.65; no sale recorded 2026-04-24: US$41.75; no sale recorded 2026-04-24: US$41.75; no sale recorded 2026-04-24: US$41.75; no sale recorded 2026-04-24: US$41.75; no sale recorded 2026-04-24: US$41.75; no sale recorded 2026-04-24: US$41.75; no sale recorded 2026-04-24: US$41.75; no sale recorded 2026-04-24: US$41.75; no sale recorded 2026-04-24: US$41.75; no sale recorded 2026-04-24: US$41.75; no sale recorded 2026-04-25: US$42.55; no sale recorded 2026-04-29: US$127.80; no sale recorded 2026-05-06: US$46.89; no sale recorded 2026-05-08: US$26.85; no sale recorded 2026-05-08: US$123.00; no sale recorded 2026-05-12: US$36.09; no sale recorded 2026-05-14: US$125.48; no sale recorded 2026-05-19: US$36.24; no sale recorded 2026-05-20: US$158.35; no sale recorded 2026-06-02: US$115.30; no sale recorded 2026-06-04: US$41.75; no sale recorded 2026-06-04: US$41.75; no sale recorded 2026-06-05: US$129.87; no sale recorded 2026-06-06: US$41.27; no sale recorded 2026-06-10: US$280.00; no sale recorded 2026-06-10: US$116.00; no sale recorded 2026-06-18: US$41.27; no sale recorded 2026-06-24: US$35.16; no sale recorded 2026-06-29: US$127.80; no sale recorded 2026-07-02: US$115.30; no sale recorded 2026-07-06: US$50.39; no sale recorded 2026-07-07: US$130.20; no sale recorded 2026-07-07: US$131.86; no sale recorded 2026-07-07: US$132.86; no sale recorded 2026-07-07: US$133.86; no sale recorded 2026-07-14: US$146.00; no sale recorded 2026-07-20: US$57.00; no sale recorded 2026-08-14: US$146.00; no sale recorded 2026-08-20: US$142.51; no sale recorded 2026-09-02: US$115.30; no sale recorded 2026-09-08: US$70.00; no sale recorded 2026-09-14: US$146.00; no sale recorded 2026-09-20: US$142.51; no sale recorded 2026-10-14: US$146.00; no sale recorded 2026-10-20: US$142.51; no sale recorded 2026-10-24: US$42.55; no sale recorded Recorded US-dollar price history Linear price scale. Horizontal axis: listing start date. Vertical axis: recorded price in US dollars. Filled dots have recorded sales; open dots have no recorded sales. The oxide step line shows calendar-month medians, with gaps for missing months. 0.00 200.00 400.00 600.00 800.00 Mar 2017 Dec 2021 Oct 2026 2017-03-26: US$62.89; no sale recorded 2017-04-24: US$63.90; no sale recorded 2017-05-09: US$60.14; no sale recorded 2017-05-15: US$42.96; no sale recorded 2017-07-19: US$40.05; no sale recorded 2017-09-26: US$59.43; no sale recorded 2017-11-21: US$43.83; no sale recorded 2018-01-25: US$43.81; no sale recorded 2018-02-23: US$59.43; no sale recorded 2018-05-16: US$240.87; no sale recorded 2018-07-05: US$44.04; no sale recorded 2019-01-11: US$42.92; no sale recorded 2019-09-27: US$230.77; no sale recorded 2019-10-22: US$65.03; no sale recorded 2019-11-23: US$57.00; no sale recorded 2019-11-29: US$104.23; no sale recorded 2019-12-12: US$104.23; no sale recorded 2020-02-11: US$42.11; no sale recorded 2020-02-21: US$68.64; no sale recorded 2020-03-24: US$104.22; no sale recorded 2020-03-24: US$104.22; no sale recorded 2020-07-07: US$42.56; no sale recorded 2020-07-15: US$85.00; no sale recorded 2020-09-22: US$58.00; no sale recorded 2020-10-02: US$44.99; no sale recorded 2020-10-10: US$58.00; no sale recorded 2021-04-13: US$88.20; no sale recorded 2021-04-20: US$46.12; no sale recorded 2021-04-21: US$90.00; no sale recorded 2022-04-26: US$43.39; no sale recorded 2022-05-17: US$77.62; no sale recorded 2022-06-01: US$130.40; no sale recorded 2022-08-01: US$196.24; sold recorded 2022-08-02: US$132.27; no sale recorded 2022-08-23: US$200.00; sold recorded 2022-08-29: US$117.48; sold recorded 2022-09-04: US$39.20; no sale recorded 2022-09-16: US$43.39; no sale recorded 2022-10-06: US$118.00; no sale recorded 2023-02-13: US$240.00; no sale recorded 2023-03-27: US$75.00; no sale recorded 2023-03-29: US$204.60; no sale recorded 2023-04-19: US$110.00; no sale recorded 2023-08-30: US$43.88; no sale recorded 2023-09-04: US$39.20; no sale recorded 2023-09-27: US$42.00; no sale recorded 2023-10-20: US$42.00; no sale recorded 2023-10-27: US$40.75; no sale recorded 2023-12-25: US$69.90; no sale recorded 2024-01-23: US$105.90; no sale recorded 2024-03-12: US$181.00; no sale recorded 2024-04-11: US$199.00; no sale recorded 2024-04-19: US$149.00; sold recorded 2024-04-22: US$41.95; no sale recorded 2024-05-09: US$235.99; sold recorded 2024-05-11: US$188.00; no sale recorded 2024-05-11: US$200.00; no sale recorded 2024-05-15: US$70.99; no sale recorded 2024-05-31: US$228.86; no sale recorded 2024-07-03: US$243.00; no sale recorded 2024-07-09: US$134.32; no sale recorded 2024-07-09: US$9.99; no sale recorded 2024-07-09: US$10.00; no sale recorded 2024-07-11: US$208.68; sold recorded 2024-07-12: US$146.00; sold recorded 2024-08-10: US$33.94; sold recorded 2024-08-27: US$35.73; no sale recorded 2024-08-29: US$72.39; no sale recorded 2024-09-19: US$65.71; sold recorded 2024-09-20: US$225.00; no sale recorded 2024-10-17: US$38.96; no sale recorded 2024-10-24: US$162.17; sold recorded 2024-11-15: US$79.21; no sale recorded 2024-12-16: US$41.74; no sale recorded 2024-12-20: US$158.35; no sale recorded 2024-12-27: US$399.46; no sale recorded 2024-12-30: US$112.65; sold recorded 2025-01-27: US$97.28; no sale recorded 2025-02-10: US$116.00; no sale recorded 2025-02-11: US$128.00; sold recorded 2025-02-26: US$117.00; no sale recorded 2025-03-11: US$78.75; no sale recorded 2025-03-13: US$33.99; no sale recorded 2025-03-18: US$161.50; no sale recorded 2025-03-26: US$37.99; no sale recorded 2025-04-08: US$123.00; no sale recorded 2025-04-11: US$55.00; no sale recorded 2025-04-16: US$41.75; no sale recorded 2025-05-13: US$33.75; no sale recorded 2025-05-24: US$129.27; no sale recorded 2025-05-26: US$71.00; no sale recorded 2025-05-29: US$89.79; no sale recorded 2025-06-09: US$57.56; no sale recorded 2025-06-12: US$55.00; no sale recorded 2025-06-12: US$103.24; no sale recorded 2025-06-18: US$41.75; no sale recorded 2025-07-03: US$132.96; no sale recorded 2025-07-04: US$128.53; no sale recorded 2025-07-04: US$128.64; no sale recorded 2025-07-04: US$129.09; no sale recorded 2025-07-09: US$34.00; no sale recorded 2025-07-14: US$68.00; no sale recorded 2025-07-17: US$172.47; no sale recorded 2025-07-18: US$69.99; no sale recorded 2025-07-18: US$172.41; no sale recorded 2025-07-23: US$130.20; no sale recorded 2025-08-01: US$50.00; no sale recorded 2025-08-04: US$117.00; no sale recorded 2025-08-11: US$96.03; no sale recorded 2025-08-13: US$93.24; no sale recorded 2025-08-14: US$113.24; no sale recorded 2025-08-15: US$32.00; no sale recorded 2025-08-16: US$121.10; no sale recorded 2025-08-18: US$29.90; no sale recorded 2025-08-20: US$33.89; no sale recorded 2025-08-25: US$69.99; no sale recorded 2025-08-25: US$66.72; no sale recorded 2025-08-25: US$66.61; no sale recorded 2025-08-25: US$66.39; no sale recorded 2025-08-25: US$66.06; no sale recorded 2025-08-25: US$65.95; no sale recorded 2025-08-25: US$66.80; no sale recorded 2025-08-25: US$66.92; no sale recorded 2025-09-04: US$34.10; no sale recorded 2025-09-06: US$128.24; no sale recorded 2025-09-10: US$41.73; no sale recorded 2025-09-11: US$41.73; no sale recorded 2025-09-11: US$41.73; no sale recorded 2025-09-13: US$76.85; no sale recorded 2025-09-13: US$76.73; no sale recorded 2025-09-13: US$41.74; no sale recorded 2025-09-13: US$76.62; no sale recorded 2025-09-13: US$41.74; no sale recorded 2025-09-13: US$41.74; no sale recorded 2025-09-13: US$41.74; no sale recorded 2025-09-13: US$41.74; no sale recorded 2025-09-13: US$41.74; no sale recorded 2025-09-13: US$41.74; no sale recorded 2025-09-13: US$41.74; no sale recorded 2025-09-13: US$41.74; no sale recorded 2025-09-13: US$41.74; no sale recorded 2025-09-13: US$41.74; no sale recorded 2025-09-14: US$41.74; no sale recorded 2025-09-15: US$41.74; no sale recorded 2025-09-15: US$41.74; no sale recorded 2025-09-15: US$41.74; no sale recorded 2025-09-15: US$41.74; no sale recorded 2025-09-16: US$41.74; no sale recorded 2025-09-17: US$41.74; no sale recorded 2025-09-18: US$63.02; no sale recorded 2025-09-18: US$41.74; no sale recorded 2025-09-18: US$41.74; no sale recorded 2025-09-18: US$41.74; no sale recorded 2025-09-19: US$134.20; no sale recorded 2025-09-22: US$98.00; no sale recorded 2025-09-30: US$81.93; no sale recorded 2025-10-03: US$133.21; no sale recorded 2025-10-07: US$59.93; no sale recorded 2025-10-07: US$39.89; no sale recorded 2025-10-11: US$533.96; no sale recorded 2025-10-11: US$32.29; no sale recorded 2025-10-16: US$31.15; no sale recorded 2025-10-18: US$32.12; no sale recorded 2025-10-21: US$125.66; no sale recorded 2025-10-28: US$43.77; no sale recorded 2025-11-05: US$150.79; no sale recorded 2025-11-06: US$33.50; no sale recorded 2025-11-20: US$68.99; no sale recorded 2025-12-04: US$30.21; no sale recorded 2025-12-04: US$30.21; no sale recorded 2025-12-06: US$109.75; no sale recorded 2025-12-07: US$116.93; no sale recorded 2025-12-07: US$151.45; no sale recorded 2025-12-07: US$115.53; no sale recorded 2025-12-08: US$122.53; no sale recorded 2025-12-12: US$66.00; no sale recorded 2025-12-17: US$45.16; no sale recorded 2025-12-17: US$115.00; no sale recorded 2025-12-23: US$130.20; no sale recorded 2025-12-25: US$27.89; no sale recorded 2025-12-26: US$62.92; no sale recorded 2026-01-12: US$66.49; no sale recorded 2026-01-12: US$66.11; no sale recorded 2026-01-12: US$66.49; no sale recorded 2026-01-12: US$66.25; no sale recorded 2026-01-14: US$146.00; no sale recorded 2026-01-16: US$88.24; no sale recorded 2026-01-23: US$130.20; no sale recorded 2026-02-06: US$91.64; no sale recorded 2026-03-03: US$51.29; no sale recorded 2026-03-10: US$113.24; no sale recorded 2026-03-28: US$30.20; no sale recorded 2026-04-02: US$115.30; no sale recorded 2026-04-17: US$33.50; no sale recorded 2026-04-23: US$131.86; no sale recorded 2026-04-23: US$132.86; no sale recorded 2026-04-23: US$133.86; no sale recorded 2026-04-23: US$130.20; no sale recorded 2026-04-24: US$46.55; no sale recorded 2026-04-24: US$41.75; no sale recorded 2026-04-24: US$43.65; no sale recorded 2026-04-24: US$41.75; no sale recorded 2026-04-24: US$41.75; no sale recorded 2026-04-24: US$41.75; no sale recorded 2026-04-24: US$41.75; no sale recorded 2026-04-24: US$41.75; no sale recorded 2026-04-24: US$41.75; no sale recorded 2026-04-24: US$41.75; no sale recorded 2026-04-24: US$41.75; no sale recorded 2026-04-24: US$41.75; no sale recorded 2026-04-24: US$41.75; no sale recorded 2026-04-25: US$42.55; no sale recorded 2026-04-29: US$127.80; no sale recorded 2026-05-06: US$46.89; no sale recorded 2026-05-08: US$26.85; no sale recorded 2026-05-08: US$123.00; no sale recorded 2026-05-12: US$36.09; no sale recorded 2026-05-14: US$125.48; no sale recorded 2026-05-19: US$36.24; no sale recorded 2026-05-20: US$158.35; no sale recorded 2026-06-02: US$115.30; no sale recorded 2026-06-04: US$41.75; no sale recorded 2026-06-04: US$41.75; no sale recorded 2026-06-05: US$129.87; no sale recorded 2026-06-06: US$41.27; no sale recorded 2026-06-10: US$280.00; no sale recorded 2026-06-10: US$116.00; no sale recorded 2026-06-18: US$41.27; no sale recorded 2026-06-24: US$35.16; no sale recorded 2026-06-29: US$127.80; no sale recorded 2026-07-02: US$115.30; no sale recorded 2026-07-06: US$50.39; no sale recorded 2026-07-07: US$130.20; no sale recorded 2026-07-07: US$131.86; no sale recorded 2026-07-07: US$132.86; no sale recorded 2026-07-07: US$133.86; no sale recorded 2026-07-14: US$146.00; no sale recorded 2026-07-20: US$57.00; no sale recorded 2026-08-14: US$146.00; no sale recorded 2026-08-20: US$142.51; no sale recorded 2026-09-02: US$115.30; no sale recorded 2026-09-08: US$70.00; no sale recorded 2026-09-14: US$146.00; no sale recorded 2026-09-20: US$142.51; no sale recorded 2026-10-14: US$146.00; no sale recorded 2026-10-20: US$142.51; no sale recorded 2026-10-24: US$42.55; no sale recorded Sold recorded No sale recorded Monthly median
Linear price scale. Dates are listing starts.
Median recorded price, all years $66.61 247 plotted records from 247 US-dollar records in this range. Monthly medians use all records in each calendar month.