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. 0.00 250.00 500.00 750.00 1000.00 Jan 2018 Mar 2020 May 2022 Jul 2024 Oct 2026 2018-01-18: US$59.95; sold recorded 2018-04-25: US$25.00; no sale recorded 2018-04-29: US$24.99; no sale recorded 2018-05-03: US$19.99; no sale recorded 2018-05-06: US$16.99; no sale recorded 2018-05-09: US$16.99; no sale recorded 2018-05-12: US$16.99; no sale recorded 2018-06-01: US$16.99; no sale recorded 2018-07-01: US$14.99; no sale recorded 2018-07-19: US$25.00; no sale recorded 2019-01-06: US$57.99; sold recorded 2019-01-25: US$19.99; no sale recorded 2019-01-28: US$14.99; no sale recorded 2019-10-09: US$44.99; sold recorded 2020-03-21: US$53.00; no sale recorded 2020-06-22: US$90.90; sold recorded 2020-09-17: US$18.33; no sale recorded 2020-09-17: US$18.33; no sale recorded 2020-10-16: US$57.00; sold recorded 2021-01-25: US$109.95; no sale recorded 2021-02-04: US$30.60; no sale recorded 2021-04-15: US$17.69; no sale recorded 2022-01-10: US$36.00; sold recorded 2022-02-27: US$55.00; sold recorded 2022-03-15: US$16.46; no sale recorded 2022-03-22: US$105.59; no sale recorded 2022-03-27: US$98.00; sold recorded 2022-03-29: US$85.59; sold recorded 2022-04-15: US$129.96; no sale recorded 2022-04-28: US$141.79; no sale recorded 2022-04-28: US$141.69; no sale recorded 2022-04-28: US$141.67; no sale recorded 2022-04-28: US$141.71; no sale recorded 2022-04-28: US$141.73; no sale recorded 2022-04-28: US$141.75; no sale recorded 2022-04-28: US$141.77; no sale recorded 2022-05-04: US$239.22; no sale recorded 2022-05-06: US$38.44; no sale recorded 2022-05-10: US$84.38; sold recorded 2022-05-11: US$99.99; no sale recorded 2022-05-21: US$71.00; no sale recorded 2022-06-08: US$46.32; no sale recorded 2022-06-16: US$35.95; no sale recorded 2022-06-25: US$99.99; sold recorded 2022-06-25: US$75.00; no sale recorded 2022-06-28: US$25.00; sold recorded 2022-07-14: US$82.87; sold recorded 2022-08-04: US$100.00; no sale recorded 2022-08-14: US$70.29; no sale recorded 2022-09-07: US$239.22; no sale recorded 2022-09-08: US$239.22; no sale recorded 2022-09-09: US$139.23; no sale recorded 2022-09-09: US$139.19; no sale recorded 2022-09-09: US$139.17; no sale recorded 2022-09-09: US$139.15; no sale recorded 2022-09-09: US$139.13; no sale recorded 2022-09-09: US$139.11; no sale recorded 2022-09-22: US$146.99; no sale recorded 2022-09-29: US$94.99; sold recorded 2022-10-12: US$162.00; no sale recorded 2022-11-15: US$39.98; no sale recorded 2022-11-28: US$85.88; no sale recorded 2022-11-29: US$88.25; no sale recorded 2022-12-02: US$39.99; sold recorded 2022-12-02: US$80.73; no sale recorded 2022-12-16: US$79.87; no sale recorded 2023-01-02: US$38.44; sold recorded 2023-01-11: US$55.97; no sale recorded 2023-01-12: US$38.99; sold recorded 2023-01-14: US$34.99; sold recorded 2023-01-15: US$107.92; no sale recorded 2023-01-22: US$99.00; no sale recorded 2023-02-06: US$139.33; no sale recorded 2023-02-07: US$139.23; no sale recorded 2023-03-02: US$99.70; no sale recorded 2023-03-13: US$106.25; no sale recorded 2023-03-27: US$106.25; no sale recorded 2023-03-30: US$86.00; no sale recorded 2023-04-06: US$139.01; no sale recorded 2023-04-06: US$139.05; no sale recorded 2023-04-06: US$139.09; no sale recorded 2023-04-24: US$88.00; no sale recorded 2023-05-18: US$18.75; sold recorded 2023-05-24: US$35.95; no sale recorded 2023-06-02: US$155.00; no sale recorded 2023-06-02: US$135.00; no sale recorded 2023-06-05: US$139.21; no sale recorded 2023-06-07: US$148.71; no sale recorded 2023-06-07: US$139.15; no sale recorded 2023-06-28: US$88.75; no sale recorded 2023-07-07: US$146.68; no sale recorded 2023-07-18: US$27.15; no sale recorded 2023-09-23: US$175.00; no sale recorded 2023-10-05: US$93.42; no sale recorded 2023-10-06: US$25.72; no sale recorded 2023-10-06: US$55.00; sold recorded 2023-10-11: US$161.00; no sale recorded 2023-10-21: US$139.99; no sale recorded 2023-11-03: US$44.00; no sale recorded 2023-12-22: US$97.56; no sale recorded 2024-01-03: US$86.00; no sale recorded 2024-01-03: US$120.08; sold recorded 2024-01-09: US$121.12; no sale recorded 2024-01-12: US$138.00; no sale recorded 2024-01-15: US$52.99; no sale recorded 2024-01-18: US$137.47; no sale recorded 2024-01-22: US$90.00; no sale recorded 2024-01-22: US$12.00; no sale recorded 2024-01-22: US$50.00; sold recorded 2024-02-14: US$65.00; sold recorded 2024-02-14: US$104.00; sold recorded 2024-02-25: US$46.99; sold recorded 2024-02-27: US$28.58; sold recorded 2024-03-05: US$83.60; no sale recorded 2024-03-18: US$59.99; no sale recorded 2024-03-27: US$145.74; no sale recorded 2024-03-27: US$249.99; no sale recorded 2024-03-30: US$144.89; no sale recorded 2024-04-07: US$105.00; no sale recorded 2024-04-07: US$34.77; no sale recorded 2024-04-07: US$28.99; sold recorded 2024-04-14: US$42.39; no sale recorded 2024-04-16: US$79.87; no sale recorded 2024-04-30: US$137.00; no sale recorded 2024-05-11: US$87.11; no sale recorded 2024-05-17: US$136.00; sold recorded 2024-05-18: US$100.00; no sale recorded 2024-05-25: US$79.82; no sale recorded 2024-06-03: US$76.99; no sale recorded 2024-06-03: US$89.00; sold recorded 2024-06-04: US$66.46; no sale recorded 2024-06-06: US$146.67; no sale recorded 2024-06-06: US$148.70; no sale recorded 2024-06-08: US$351.00; no sale recorded 2024-06-11: US$129.05; no sale recorded 2024-06-21: US$104.89; sold recorded 2024-06-21: US$52.88; sold recorded 2024-06-27: US$128.80; sold recorded 2024-07-05: US$139.17; no sale recorded 2024-07-20: US$50.00; no sale recorded 2024-07-25: US$85.88; no sale recorded 2024-07-25: US$34.99; sold recorded 2024-08-11: US$70.00; no sale recorded 2024-08-11: US$800.00; no sale recorded 2024-08-12: US$104.86; sold recorded 2024-08-16: US$75.00; no sale recorded 2024-08-23: US$34.40; sold recorded 2024-08-25: US$29.50; no sale recorded 2024-08-25: US$75.00; no sale recorded 2024-09-03: US$69.33; no sale recorded 2024-09-07: US$74.99; sold recorded 2024-10-10: US$39.74; sold recorded 2024-10-16: US$20.00; no sale recorded 2024-10-21: US$220.00; no sale recorded 2024-10-24: US$88.00; no sale recorded 2024-10-28: US$89.00; sold recorded 2024-11-01: US$89.00; sold recorded 2024-11-03: US$97.72; sold recorded 2024-12-02: US$102.86; sold recorded 2024-12-30: US$140.00; no sale recorded 2024-12-30: US$143.00; sold recorded 2025-01-08: US$52.99; sold recorded 2025-01-27: US$143.00; sold recorded 2025-01-28: US$40.00; no sale recorded 2025-01-28: US$181.00; sold recorded 2025-02-20: US$104.89; no sale recorded 2025-03-16: US$99.00; no sale recorded 2025-04-07: US$52.99; no sale recorded 2025-04-11: US$88.00; no sale recorded 2025-04-12: US$117.00; no sale recorded 2025-04-16: US$89.99; sold recorded 2025-04-17: US$128.80; no sale recorded 2025-04-23: US$90.00; sold recorded 2025-04-23: US$90.00; sold recorded 2025-04-23: US$90.00; sold recorded 2025-04-23: US$90.00; sold recorded 2025-04-23: US$90.00; sold recorded 2025-04-25: US$189.00; no sale recorded 2025-04-30: US$85.98; sold recorded 2025-05-13: US$89.00; no sale recorded 2025-05-15: US$81.97; no sale recorded 2025-06-05: US$85.88; no sale recorded 2025-06-06: US$138.00; no sale recorded 2025-06-10: US$88.90; no sale recorded 2025-06-10: US$87.32; no sale recorded 2025-06-10: US$85.80; no sale recorded 2025-06-10: US$85.00; no sale recorded 2025-06-12: US$76.00; no sale recorded 2025-06-14: US$89.95; no sale recorded 2025-06-14: US$91.00; no sale recorded 2025-06-14: US$91.46; no sale recorded 2025-06-19: US$85.88; no sale recorded 2025-06-24: US$158.00; no sale recorded 2025-07-06: US$52.99; no sale recorded 2025-07-06: US$77.96; no sale recorded 2025-07-09: US$113.15; no sale recorded 2025-07-09: US$104.55; no sale recorded 2025-07-09: US$109.17; no sale recorded 2025-07-18: US$175.43; no sale recorded 2025-07-18: US$69.99; no sale recorded 2025-07-24: US$99.99; no sale recorded 2025-07-31: US$59.00; no sale recorded 2025-08-06: US$70.95; no sale recorded 2025-08-19: US$99.98; no sale recorded 2025-08-21: US$194.00; no sale recorded 2025-08-25: US$60.94; no sale recorded 2025-08-26: US$255.00; no sale recorded 2025-08-27: US$52.16; no sale recorded 2025-09-04: US$48.93; no sale recorded 2025-09-05: US$194.00; no sale recorded 2025-09-06: US$30.00; no sale recorded 2025-09-10: US$99.00; no sale recorded 2025-09-17: US$99.99; no sale recorded 2025-09-22: US$44.92; no sale recorded 2025-09-30: US$38.91; no sale recorded 2025-10-18: US$83.50; no sale recorded 2025-10-27: US$157.00; no sale recorded 2025-10-29: US$59.99; no sale recorded 2025-10-30: US$140.00; no sale recorded 2025-11-01: US$139.18; no sale recorded 2025-11-05: US$139.27; no sale recorded 2025-12-05: US$151.30; no sale recorded 2025-12-10: US$109.00; no sale recorded 2025-12-13: US$164.70; no sale recorded 2026-01-01: US$109.99; no sale recorded 2026-01-13: US$83.00; no sale recorded 2026-01-23: US$50.00; no sale recorded 2026-02-02: US$158.00; no sale recorded 2026-03-10: US$203.00; no sale recorded 2026-03-16: US$94.95; no sale recorded 2026-03-16: US$94.97; no sale recorded 2026-03-17: US$196.00; no sale recorded 2026-05-04: US$69.60; no sale recorded 2026-05-14: US$40.00; no sale recorded 2026-05-18: US$69.60; no sale recorded 2026-05-19: US$69.60; no sale recorded 2026-06-01: US$449.99; no sale recorded 2026-06-12: US$123.43; no sale recorded 2026-07-01: US$140.00; no sale recorded 2026-07-07: US$39.99; no sale recorded 2026-07-18: US$92.99; no sale recorded 2026-07-18: US$92.87; no sale recorded 2026-07-18: US$92.95; no sale recorded 2026-07-18: US$92.79; no sale recorded 2026-08-18: US$85.79; no sale recorded 2026-08-18: US$149.78; no sale recorded 2026-09-04: US$85.79; no sale recorded 2026-09-26: US$58.00; no sale recorded 2026-10-02: US$125.00; 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. 0.00 250.00 500.00 750.00 1000.00 Jan 2018 May 2022 Oct 2026 2018-01-18: US$59.95; sold recorded 2018-04-25: US$25.00; no sale recorded 2018-04-29: US$24.99; no sale recorded 2018-05-03: US$19.99; no sale recorded 2018-05-06: US$16.99; no sale recorded 2018-05-09: US$16.99; no sale recorded 2018-05-12: US$16.99; no sale recorded 2018-06-01: US$16.99; no sale recorded 2018-07-01: US$14.99; no sale recorded 2018-07-19: US$25.00; no sale recorded 2019-01-06: US$57.99; sold recorded 2019-01-25: US$19.99; no sale recorded 2019-01-28: US$14.99; no sale recorded 2019-10-09: US$44.99; sold recorded 2020-03-21: US$53.00; no sale recorded 2020-06-22: US$90.90; sold recorded 2020-09-17: US$18.33; no sale recorded 2020-09-17: US$18.33; no sale recorded 2020-10-16: US$57.00; sold recorded 2021-01-25: US$109.95; no sale recorded 2021-02-04: US$30.60; no sale recorded 2021-04-15: US$17.69; no sale recorded 2022-01-10: US$36.00; sold recorded 2022-02-27: US$55.00; sold recorded 2022-03-15: US$16.46; no sale recorded 2022-03-22: US$105.59; no sale recorded 2022-03-27: US$98.00; sold recorded 2022-03-29: US$85.59; sold recorded 2022-04-15: US$129.96; no sale recorded 2022-04-28: US$141.79; no sale recorded 2022-04-28: US$141.69; no sale recorded 2022-04-28: US$141.67; no sale recorded 2022-04-28: US$141.71; no sale recorded 2022-04-28: US$141.73; no sale recorded 2022-04-28: US$141.75; no sale recorded 2022-04-28: US$141.77; no sale recorded 2022-05-04: US$239.22; no sale recorded 2022-05-06: US$38.44; no sale recorded 2022-05-10: US$84.38; sold recorded 2022-05-11: US$99.99; no sale recorded 2022-05-21: US$71.00; no sale recorded 2022-06-08: US$46.32; no sale recorded 2022-06-16: US$35.95; no sale recorded 2022-06-25: US$99.99; sold recorded 2022-06-25: US$75.00; no sale recorded 2022-06-28: US$25.00; sold recorded 2022-07-14: US$82.87; sold recorded 2022-08-04: US$100.00; no sale recorded 2022-08-14: US$70.29; no sale recorded 2022-09-07: US$239.22; no sale recorded 2022-09-08: US$239.22; no sale recorded 2022-09-09: US$139.23; no sale recorded 2022-09-09: US$139.19; no sale recorded 2022-09-09: US$139.17; no sale recorded 2022-09-09: US$139.15; no sale recorded 2022-09-09: US$139.13; no sale recorded 2022-09-09: US$139.11; no sale recorded 2022-09-22: US$146.99; no sale recorded 2022-09-29: US$94.99; sold recorded 2022-10-12: US$162.00; no sale recorded 2022-11-15: US$39.98; no sale recorded 2022-11-28: US$85.88; no sale recorded 2022-11-29: US$88.25; no sale recorded 2022-12-02: US$39.99; sold recorded 2022-12-02: US$80.73; no sale recorded 2022-12-16: US$79.87; no sale recorded 2023-01-02: US$38.44; sold recorded 2023-01-11: US$55.97; no sale recorded 2023-01-12: US$38.99; sold recorded 2023-01-14: US$34.99; sold recorded 2023-01-15: US$107.92; no sale recorded 2023-01-22: US$99.00; no sale recorded 2023-02-06: US$139.33; no sale recorded 2023-02-07: US$139.23; no sale recorded 2023-03-02: US$99.70; no sale recorded 2023-03-13: US$106.25; no sale recorded 2023-03-27: US$106.25; no sale recorded 2023-03-30: US$86.00; no sale recorded 2023-04-06: US$139.01; no sale recorded 2023-04-06: US$139.05; no sale recorded 2023-04-06: US$139.09; no sale recorded 2023-04-24: US$88.00; no sale recorded 2023-05-18: US$18.75; sold recorded 2023-05-24: US$35.95; no sale recorded 2023-06-02: US$155.00; no sale recorded 2023-06-02: US$135.00; no sale recorded 2023-06-05: US$139.21; no sale recorded 2023-06-07: US$148.71; no sale recorded 2023-06-07: US$139.15; no sale recorded 2023-06-28: US$88.75; no sale recorded 2023-07-07: US$146.68; no sale recorded 2023-07-18: US$27.15; no sale recorded 2023-09-23: US$175.00; no sale recorded 2023-10-05: US$93.42; no sale recorded 2023-10-06: US$25.72; no sale recorded 2023-10-06: US$55.00; sold recorded 2023-10-11: US$161.00; no sale recorded 2023-10-21: US$139.99; no sale recorded 2023-11-03: US$44.00; no sale recorded 2023-12-22: US$97.56; no sale recorded 2024-01-03: US$86.00; no sale recorded 2024-01-03: US$120.08; sold recorded 2024-01-09: US$121.12; no sale recorded 2024-01-12: US$138.00; no sale recorded 2024-01-15: US$52.99; no sale recorded 2024-01-18: US$137.47; no sale recorded 2024-01-22: US$90.00; no sale recorded 2024-01-22: US$12.00; no sale recorded 2024-01-22: US$50.00; sold recorded 2024-02-14: US$65.00; sold recorded 2024-02-14: US$104.00; sold recorded 2024-02-25: US$46.99; sold recorded 2024-02-27: US$28.58; sold recorded 2024-03-05: US$83.60; no sale recorded 2024-03-18: US$59.99; no sale recorded 2024-03-27: US$145.74; no sale recorded 2024-03-27: US$249.99; no sale recorded 2024-03-30: US$144.89; no sale recorded 2024-04-07: US$105.00; no sale recorded 2024-04-07: US$34.77; no sale recorded 2024-04-07: US$28.99; sold recorded 2024-04-14: US$42.39; no sale recorded 2024-04-16: US$79.87; no sale recorded 2024-04-30: US$137.00; no sale recorded 2024-05-11: US$87.11; no sale recorded 2024-05-17: US$136.00; sold recorded 2024-05-18: US$100.00; no sale recorded 2024-05-25: US$79.82; no sale recorded 2024-06-03: US$76.99; no sale recorded 2024-06-03: US$89.00; sold recorded 2024-06-04: US$66.46; no sale recorded 2024-06-06: US$146.67; no sale recorded 2024-06-06: US$148.70; no sale recorded 2024-06-08: US$351.00; no sale recorded 2024-06-11: US$129.05; no sale recorded 2024-06-21: US$104.89; sold recorded 2024-06-21: US$52.88; sold recorded 2024-06-27: US$128.80; sold recorded 2024-07-05: US$139.17; no sale recorded 2024-07-20: US$50.00; no sale recorded 2024-07-25: US$85.88; no sale recorded 2024-07-25: US$34.99; sold recorded 2024-08-11: US$70.00; no sale recorded 2024-08-11: US$800.00; no sale recorded 2024-08-12: US$104.86; sold recorded 2024-08-16: US$75.00; no sale recorded 2024-08-23: US$34.40; sold recorded 2024-08-25: US$29.50; no sale recorded 2024-08-25: US$75.00; no sale recorded 2024-09-03: US$69.33; no sale recorded 2024-09-07: US$74.99; sold recorded 2024-10-10: US$39.74; sold recorded 2024-10-16: US$20.00; no sale recorded 2024-10-21: US$220.00; no sale recorded 2024-10-24: US$88.00; no sale recorded 2024-10-28: US$89.00; sold recorded 2024-11-01: US$89.00; sold recorded 2024-11-03: US$97.72; sold recorded 2024-12-02: US$102.86; sold recorded 2024-12-30: US$140.00; no sale recorded 2024-12-30: US$143.00; sold recorded 2025-01-08: US$52.99; sold recorded 2025-01-27: US$143.00; sold recorded 2025-01-28: US$40.00; no sale recorded 2025-01-28: US$181.00; sold recorded 2025-02-20: US$104.89; no sale recorded 2025-03-16: US$99.00; no sale recorded 2025-04-07: US$52.99; no sale recorded 2025-04-11: US$88.00; no sale recorded 2025-04-12: US$117.00; no sale recorded 2025-04-16: US$89.99; sold recorded 2025-04-17: US$128.80; no sale recorded 2025-04-23: US$90.00; sold recorded 2025-04-23: US$90.00; sold recorded 2025-04-23: US$90.00; sold recorded 2025-04-23: US$90.00; sold recorded 2025-04-23: US$90.00; sold recorded 2025-04-25: US$189.00; no sale recorded 2025-04-30: US$85.98; sold recorded 2025-05-13: US$89.00; no sale recorded 2025-05-15: US$81.97; no sale recorded 2025-06-05: US$85.88; no sale recorded 2025-06-06: US$138.00; no sale recorded 2025-06-10: US$88.90; no sale recorded 2025-06-10: US$87.32; no sale recorded 2025-06-10: US$85.80; no sale recorded 2025-06-10: US$85.00; no sale recorded 2025-06-12: US$76.00; no sale recorded 2025-06-14: US$89.95; no sale recorded 2025-06-14: US$91.00; no sale recorded 2025-06-14: US$91.46; no sale recorded 2025-06-19: US$85.88; no sale recorded 2025-06-24: US$158.00; no sale recorded 2025-07-06: US$52.99; no sale recorded 2025-07-06: US$77.96; no sale recorded 2025-07-09: US$113.15; no sale recorded 2025-07-09: US$104.55; no sale recorded 2025-07-09: US$109.17; no sale recorded 2025-07-18: US$175.43; no sale recorded 2025-07-18: US$69.99; no sale recorded 2025-07-24: US$99.99; no sale recorded 2025-07-31: US$59.00; no sale recorded 2025-08-06: US$70.95; no sale recorded 2025-08-19: US$99.98; no sale recorded 2025-08-21: US$194.00; no sale recorded 2025-08-25: US$60.94; no sale recorded 2025-08-26: US$255.00; no sale recorded 2025-08-27: US$52.16; no sale recorded 2025-09-04: US$48.93; no sale recorded 2025-09-05: US$194.00; no sale recorded 2025-09-06: US$30.00; no sale recorded 2025-09-10: US$99.00; no sale recorded 2025-09-17: US$99.99; no sale recorded 2025-09-22: US$44.92; no sale recorded 2025-09-30: US$38.91; no sale recorded 2025-10-18: US$83.50; no sale recorded 2025-10-27: US$157.00; no sale recorded 2025-10-29: US$59.99; no sale recorded 2025-10-30: US$140.00; no sale recorded 2025-11-01: US$139.18; no sale recorded 2025-11-05: US$139.27; no sale recorded 2025-12-05: US$151.30; no sale recorded 2025-12-10: US$109.00; no sale recorded 2025-12-13: US$164.70; no sale recorded 2026-01-01: US$109.99; no sale recorded 2026-01-13: US$83.00; no sale recorded 2026-01-23: US$50.00; no sale recorded 2026-02-02: US$158.00; no sale recorded 2026-03-10: US$203.00; no sale recorded 2026-03-16: US$94.95; no sale recorded 2026-03-16: US$94.97; no sale recorded 2026-03-17: US$196.00; no sale recorded 2026-05-04: US$69.60; no sale recorded 2026-05-14: US$40.00; no sale recorded 2026-05-18: US$69.60; no sale recorded 2026-05-19: US$69.60; no sale recorded 2026-06-01: US$449.99; no sale recorded 2026-06-12: US$123.43; no sale recorded 2026-07-01: US$140.00; no sale recorded 2026-07-07: US$39.99; no sale recorded 2026-07-18: US$92.99; no sale recorded 2026-07-18: US$92.87; no sale recorded 2026-07-18: US$92.95; no sale recorded 2026-07-18: US$92.79; no sale recorded 2026-08-18: US$85.79; no sale recorded 2026-08-18: US$149.78; no sale recorded 2026-09-04: US$85.79; no sale recorded 2026-09-26: US$58.00; no sale recorded 2026-10-02: US$125.00; no sale recorded Sold recorded No sale recorded Monthly median
Linear price scale. Dates are listing starts.
Median recorded price, all years $89.99 249 plotted records from 249 US-dollar records in this range. Monthly medians use all records in each calendar month.