Recorded price history USD Listing start period All years 5 years 1 year
Recorded US-dollar price history Logarithmic price scale (price + 1). 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 1 10 100 1000 10000 Mar 2017 Jul 2019 Dec 2021 May 2024 Oct 2026 2017-03-30: US$1999.99; no sale recorded 2017-04-10: US$550.00; no sale recorded 2017-04-12: US$356.84; sold recorded 2017-04-18: US$800.00; no sale recorded 2017-04-28: US$800.00; no sale recorded 2017-05-08: US$800.00; no sale recorded 2017-05-11: US$550.00; no sale recorded 2017-06-09: US$790.00; no sale recorded 2017-06-30: US$179.99; no sale recorded 2017-07-12: US$550.00; no sale recorded 2017-08-01: US$179.99; no sale recorded 2017-08-09: US$1100.00; no sale recorded 2017-08-13: US$550.00; no sale recorded 2017-09-01: US$149.99; no sale recorded 2017-10-03: US$99.99; no sale recorded 2017-10-10: US$860.00; no sale recorded 2017-10-18: US$550.00; no sale recorded 2017-10-24: US$899.61; no sale recorded 2017-11-03: US$79.99; no sale recorded 2017-11-10: US$900.00; no sale recorded 2017-11-10: US$910.00; no sale recorded 2017-11-20: US$550.00; no sale recorded 2017-12-11: US$950.00; no sale recorded 2017-12-11: US$950.00; no sale recorded 2018-01-11: US$940.00; no sale recorded 2018-01-11: US$900.00; no sale recorded 2018-01-21: US$550.00; no sale recorded 2018-02-20: US$550.00; no sale recorded 2018-02-28: US$900.00; no sale recorded 2018-03-02: US$79.99; no sale recorded 2018-03-22: US$550.00; no sale recorded 2018-04-16: US$59.99; no sale recorded 2018-05-24: US$550.00; no sale recorded 2018-06-23: US$550.00; no sale recorded 2018-08-15: US$365.76; no sale recorded 2018-09-28: US$550.00; no sale recorded 2018-10-17: US$1047.59; no sale recorded 2019-10-23: US$1354.44; no sale recorded 2019-11-22: US$1354.44; no sale recorded 2020-03-04: US$1300.00; no sale recorded 2020-03-04: US$1299.90; no sale recorded 2020-03-11: US$1273.00; no sale recorded 2020-03-11: US$472.63; sold recorded 2020-04-15: US$1320.00; no sale recorded 2020-05-27: US$2239.85; no sale recorded 2020-05-30: US$2243.35; no sale recorded 2020-06-01: US$1319.99; no sale recorded 2020-07-07: US$467.38; no sale recorded 2020-08-26: US$335.00; no sale recorded 2020-08-28: US$1299.90; no sale recorded 2020-08-28: US$1299.80; no sale recorded 2020-09-18: US$398.73; no sale recorded 2020-09-18: US$397.94; no sale recorded 2020-09-22: US$397.13; no sale recorded 2020-09-22: US$1365.00; no sale recorded 2020-09-28: US$1290.42; no sale recorded 2020-11-26: US$1376.00; no sale recorded 2021-01-05: US$1649.00; no sale recorded 2021-01-05: US$1650.00; no sale recorded 2021-04-02: US$1197.84; no sale recorded 2021-04-18: US$1338.99; no sale recorded 2021-05-25: US$1650.00; no sale recorded 2021-05-25: US$1649.00; no sale recorded 2021-06-04: US$1386.00; no sale recorded 2022-03-10: US$1996.00; no sale recorded 2022-03-25: US$2025.00; no sale recorded 2022-04-12: US$2087.25; no sale recorded 2022-04-12: US$2085.99; no sale recorded 2022-05-07: US$1492.08; no sale recorded 2022-07-05: US$2032.00; no sale recorded 2022-07-07: US$2007.00; no sale recorded 2022-07-09: US$2086.45; no sale recorded 2022-07-09: US$2086.65; no sale recorded 2022-07-11: US$2086.85; no sale recorded 2022-07-29: US$1974.00; no sale recorded 2022-08-11: US$2087.25; no sale recorded 2022-08-11: US$2085.99; no sale recorded 2022-09-21: US$1220.00; no sale recorded 2022-11-07: US$2085.99; no sale recorded 2022-11-07: US$2087.25; no sale recorded 2022-11-08: US$2086.65; no sale recorded 2022-11-08: US$2085.95; no sale recorded 2022-11-29: US$99.99; no sale recorded 2022-12-21: US$1220.00; no sale recorded 2023-02-08: US$2086.05; no sale recorded 2023-02-08: US$2086.25; no sale recorded 2023-03-23: US$2046.00; no sale recorded 2023-04-06: US$2030.00; no sale recorded 2023-04-08: US$2086.05; no sale recorded 2023-04-08: US$2086.25; no sale recorded 2023-04-08: US$2085.95; no sale recorded 2023-04-10: US$1996.00; no sale recorded 2023-05-17: US$2038.00; no sale recorded 2023-05-19: US$1960.00; no sale recorded 2023-05-23: US$2046.00; no sale recorded 2023-07-03: US$1958.00; no sale recorded 2023-07-05: US$2085.95; no sale recorded 2023-07-05: US$2086.35; no sale recorded 2023-07-05: US$2086.85; no sale recorded 2023-07-05: US$2086.25; no sale recorded 2023-08-25: US$1961.00; no sale recorded 2023-08-28: US$1894.41; no sale recorded 2023-09-06: US$1980.00; no sale recorded 2023-09-16: US$2262.00; sold recorded 2023-09-19: US$1424.00; sold recorded 2023-09-29: US$910.00; no sale recorded 2023-10-10: US$1996.00; no sale recorded 2023-10-14: US$1950.00; no sale recorded 2023-10-18: US$2040.00; no sale recorded 2023-10-31: US$2036.00; no sale recorded 2024-01-27: US$991.00; no sale recorded 2024-02-05: US$1210.71; no sale recorded 2024-02-21: US$1972.20; no sale recorded 2024-03-18: US$1204.00; no sale recorded 2024-03-24: US$198.98; sold recorded 2024-04-02: US$155.57; no sale recorded 2024-05-20: US$2072.92; no sale recorded 2024-05-29: US$2236.85; no sale recorded 2024-05-30: US$1992.00; no sale recorded 2024-06-13: US$1971.00; no sale recorded 2024-06-13: US$33.51; no sale recorded 2024-06-20: US$2239.35; no sale recorded 2024-08-01: US$10075.47; no sale recorded 2024-08-07: US$2115.00; sold recorded 2024-09-05: US$1774.50; no sale recorded 2024-10-02: US$241.58; no sale recorded 2024-10-12: US$1254.40; no sale recorded 2024-10-17: US$2016.00; no sale recorded 2024-10-18: US$1551.82; sold recorded 2024-10-18: US$1546.36; sold recorded 2024-10-18: US$2040.00; no sale recorded 2024-10-26: US$1717.20; no sale recorded 2024-11-14: US$1260.40; no sale recorded 2024-11-14: US$1950.00; sold recorded 2024-11-21: US$1972.20; no sale recorded 2024-12-05: US$1514.40; sold recorded 2024-12-22: US$180.80; no sale recorded 2024-12-28: US$1954.00; no sale recorded 2025-01-31: US$568.00; sold recorded 2025-02-24: US$1545.40; no sale recorded 2025-02-28: US$1547.26; no sale recorded 2025-03-10: US$1968.08; no sale recorded 2025-03-14: US$1831.95; no sale recorded 2025-04-06: US$1947.00; no sale recorded 2025-04-14: US$1950.00; no sale recorded 2025-04-20: US$74.09; no sale recorded 2025-04-22: US$1262.60; sold recorded 2025-05-19: US$1960.00; no sale recorded 2025-05-20: US$1857.80; no sale recorded 2025-06-04: US$1705.99; no sale recorded 2025-06-06: US$1965.21; no sale recorded 2025-06-06: US$1700.00; no sale recorded 2025-06-07: US$1914.92; no sale recorded 2025-06-17: US$1893.32; no sale recorded 2025-06-17: US$1550.19; no sale recorded 2025-06-25: US$2025.00; no sale recorded 2025-06-30: US$1814.26; no sale recorded 2025-07-02: US$1922.72; no sale recorded 2025-07-02: US$1643.61; no sale recorded 2025-07-10: US$1762.78; no sale recorded 2025-07-17: US$1550.17; no sale recorded 2025-07-21: US$1896.20; no sale recorded 2025-07-31: US$1454.97; no sale recorded 2025-08-02: US$2082.55; no sale recorded 2025-08-05: US$2035.70; no sale recorded 2025-08-19: US$1960.00; no sale recorded 2025-08-28: US$1954.00; no sale recorded 2025-09-02: US$1490.75; no sale recorded 2025-09-04: US$1895.48; no sale recorded 2025-09-05: US$2032.00; no sale recorded 2025-09-12: US$1550.58; no sale recorded 2025-09-12: US$1550.58; no sale recorded 2025-09-15: US$1858.68; no sale recorded 2025-09-17: US$1550.18; no sale recorded 2025-09-23: US$1551.31; no sale recorded 2025-09-25: US$1886.22; no sale recorded 2025-09-26: US$1550.64; no sale recorded 2025-09-27: US$1551.22; no sale recorded 2025-09-27: US$1550.30; no sale recorded 2025-09-28: US$1550.42; no sale recorded 2025-10-21: US$1914.22; no sale recorded 2025-10-31: US$1953.71; no sale recorded 2025-10-31: US$2050.00; no sale recorded 2025-11-07: US$1838.74; no sale recorded 2025-11-30: US$1252.85; no sale recorded 2025-12-01: US$1844.85; no sale recorded 2025-12-12: US$1705.63; no sale recorded 2025-12-12: US$1705.63; no sale recorded 2025-12-22: US$1891.69; no sale recorded 2025-12-24: US$1191.60; no sale recorded 2025-12-30: US$2305.72; no sale recorded 2025-12-30: US$1185.03; no sale recorded 2026-01-10: US$898.69; no sale recorded 2026-01-14: US$898.69; no sale recorded 2026-01-22: US$898.69; no sale recorded 2026-01-22: US$2046.00; no sale recorded 2026-01-26: US$1750.26; no sale recorded 2026-01-27: US$1828.82; no sale recorded 2026-01-28: US$1751.16; no sale recorded 2026-02-06: US$2600.00; no sale recorded 2026-02-15: US$865.44; no sale recorded 2026-02-21: US$865.44; no sale recorded 2026-02-26: US$865.44; no sale recorded 2026-03-03: US$865.44; no sale recorded 2026-03-08: US$865.44; no sale recorded 2026-03-11: US$865.44; no sale recorded 2026-03-17: US$1751.71; no sale recorded 2026-03-18: US$2119.56; no sale recorded 2026-03-24: US$1525.00; no sale recorded 2026-03-25: US$2025.00; no sale recorded 2026-03-27: US$865.44; no sale recorded 2026-04-02: US$1750.16; no sale recorded 2026-04-03: US$1749.99; no sale recorded 2026-04-09: US$865.44; no sale recorded 2026-04-11: US$1751.70; no sale recorded 2026-04-19: US$865.44; no sale recorded 2026-04-21: US$695.00; no sale recorded 2026-04-22: US$865.44; no sale recorded 2026-04-23: US$1750.16; no sale recorded 2026-04-26: US$865.44; no sale recorded 2026-05-03: US$155.87; no sale recorded 2026-05-03: US$58.77; no sale recorded 2026-05-22: US$1961.92; no sale recorded 2026-05-25: US$1899.93; no sale recorded 2026-05-28: US$1899.88; no sale recorded 2026-06-03: US$1899.81; no sale recorded 2026-06-04: US$2336.91; no sale recorded 2026-06-08: US$2038.00; no sale recorded 2026-06-15: US$1439.32; no sale recorded 2026-06-15: US$1881.00; no sale recorded 2026-06-16: US$1899.91; no sale recorded 2026-06-16: US$2307.01; no sale recorded 2026-06-18: US$2279.98; no sale recorded 2026-07-03: US$1899.97; no sale recorded 2026-09-15: US$2397.70; no sale recorded 2026-09-21: US$2397.70; no sale recorded 2026-09-28: US$1218.00; no sale recorded 2026-10-23: US$1621.20; no sale recorded Recorded US-dollar price history Logarithmic price scale (price + 1). 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 1 10 100 1000 10000 Mar 2017 Dec 2021 Oct 2026 2017-03-30: US$1999.99; no sale recorded 2017-04-10: US$550.00; no sale recorded 2017-04-12: US$356.84; sold recorded 2017-04-18: US$800.00; no sale recorded 2017-04-28: US$800.00; no sale recorded 2017-05-08: US$800.00; no sale recorded 2017-05-11: US$550.00; no sale recorded 2017-06-09: US$790.00; no sale recorded 2017-06-30: US$179.99; no sale recorded 2017-07-12: US$550.00; no sale recorded 2017-08-01: US$179.99; no sale recorded 2017-08-09: US$1100.00; no sale recorded 2017-08-13: US$550.00; no sale recorded 2017-09-01: US$149.99; no sale recorded 2017-10-03: US$99.99; no sale recorded 2017-10-10: US$860.00; no sale recorded 2017-10-18: US$550.00; no sale recorded 2017-10-24: US$899.61; no sale recorded 2017-11-03: US$79.99; no sale recorded 2017-11-10: US$900.00; no sale recorded 2017-11-10: US$910.00; no sale recorded 2017-11-20: US$550.00; no sale recorded 2017-12-11: US$950.00; no sale recorded 2017-12-11: US$950.00; no sale recorded 2018-01-11: US$940.00; no sale recorded 2018-01-11: US$900.00; no sale recorded 2018-01-21: US$550.00; no sale recorded 2018-02-20: US$550.00; no sale recorded 2018-02-28: US$900.00; no sale recorded 2018-03-02: US$79.99; no sale recorded 2018-03-22: US$550.00; no sale recorded 2018-04-16: US$59.99; no sale recorded 2018-05-24: US$550.00; no sale recorded 2018-06-23: US$550.00; no sale recorded 2018-08-15: US$365.76; no sale recorded 2018-09-28: US$550.00; no sale recorded 2018-10-17: US$1047.59; no sale recorded 2019-10-23: US$1354.44; no sale recorded 2019-11-22: US$1354.44; no sale recorded 2020-03-04: US$1300.00; no sale recorded 2020-03-04: US$1299.90; no sale recorded 2020-03-11: US$1273.00; no sale recorded 2020-03-11: US$472.63; sold recorded 2020-04-15: US$1320.00; no sale recorded 2020-05-27: US$2239.85; no sale recorded 2020-05-30: US$2243.35; no sale recorded 2020-06-01: US$1319.99; no sale recorded 2020-07-07: US$467.38; no sale recorded 2020-08-26: US$335.00; no sale recorded 2020-08-28: US$1299.90; no sale recorded 2020-08-28: US$1299.80; no sale recorded 2020-09-18: US$398.73; no sale recorded 2020-09-18: US$397.94; no sale recorded 2020-09-22: US$397.13; no sale recorded 2020-09-22: US$1365.00; no sale recorded 2020-09-28: US$1290.42; no sale recorded 2020-11-26: US$1376.00; no sale recorded 2021-01-05: US$1649.00; no sale recorded 2021-01-05: US$1650.00; no sale recorded 2021-04-02: US$1197.84; no sale recorded 2021-04-18: US$1338.99; no sale recorded 2021-05-25: US$1650.00; no sale recorded 2021-05-25: US$1649.00; no sale recorded 2021-06-04: US$1386.00; no sale recorded 2022-03-10: US$1996.00; no sale recorded 2022-03-25: US$2025.00; no sale recorded 2022-04-12: US$2087.25; no sale recorded 2022-04-12: US$2085.99; no sale recorded 2022-05-07: US$1492.08; no sale recorded 2022-07-05: US$2032.00; no sale recorded 2022-07-07: US$2007.00; no sale recorded 2022-07-09: US$2086.45; no sale recorded 2022-07-09: US$2086.65; no sale recorded 2022-07-11: US$2086.85; no sale recorded 2022-07-29: US$1974.00; no sale recorded 2022-08-11: US$2087.25; no sale recorded 2022-08-11: US$2085.99; no sale recorded 2022-09-21: US$1220.00; no sale recorded 2022-11-07: US$2085.99; no sale recorded 2022-11-07: US$2087.25; no sale recorded 2022-11-08: US$2086.65; no sale recorded 2022-11-08: US$2085.95; no sale recorded 2022-11-29: US$99.99; no sale recorded 2022-12-21: US$1220.00; no sale recorded 2023-02-08: US$2086.05; no sale recorded 2023-02-08: US$2086.25; no sale recorded 2023-03-23: US$2046.00; no sale recorded 2023-04-06: US$2030.00; no sale recorded 2023-04-08: US$2086.05; no sale recorded 2023-04-08: US$2086.25; no sale recorded 2023-04-08: US$2085.95; no sale recorded 2023-04-10: US$1996.00; no sale recorded 2023-05-17: US$2038.00; no sale recorded 2023-05-19: US$1960.00; no sale recorded 2023-05-23: US$2046.00; no sale recorded 2023-07-03: US$1958.00; no sale recorded 2023-07-05: US$2085.95; no sale recorded 2023-07-05: US$2086.35; no sale recorded 2023-07-05: US$2086.85; no sale recorded 2023-07-05: US$2086.25; no sale recorded 2023-08-25: US$1961.00; no sale recorded 2023-08-28: US$1894.41; no sale recorded 2023-09-06: US$1980.00; no sale recorded 2023-09-16: US$2262.00; sold recorded 2023-09-19: US$1424.00; sold recorded 2023-09-29: US$910.00; no sale recorded 2023-10-10: US$1996.00; no sale recorded 2023-10-14: US$1950.00; no sale recorded 2023-10-18: US$2040.00; no sale recorded 2023-10-31: US$2036.00; no sale recorded 2024-01-27: US$991.00; no sale recorded 2024-02-05: US$1210.71; no sale recorded 2024-02-21: US$1972.20; no sale recorded 2024-03-18: US$1204.00; no sale recorded 2024-03-24: US$198.98; sold recorded 2024-04-02: US$155.57; no sale recorded 2024-05-20: US$2072.92; no sale recorded 2024-05-29: US$2236.85; no sale recorded 2024-05-30: US$1992.00; no sale recorded 2024-06-13: US$1971.00; no sale recorded 2024-06-13: US$33.51; no sale recorded 2024-06-20: US$2239.35; no sale recorded 2024-08-01: US$10075.47; no sale recorded 2024-08-07: US$2115.00; sold recorded 2024-09-05: US$1774.50; no sale recorded 2024-10-02: US$241.58; no sale recorded 2024-10-12: US$1254.40; no sale recorded 2024-10-17: US$2016.00; no sale recorded 2024-10-18: US$1551.82; sold recorded 2024-10-18: US$1546.36; sold recorded 2024-10-18: US$2040.00; no sale recorded 2024-10-26: US$1717.20; no sale recorded 2024-11-14: US$1260.40; no sale recorded 2024-11-14: US$1950.00; sold recorded 2024-11-21: US$1972.20; no sale recorded 2024-12-05: US$1514.40; sold recorded 2024-12-22: US$180.80; no sale recorded 2024-12-28: US$1954.00; no sale recorded 2025-01-31: US$568.00; sold recorded 2025-02-24: US$1545.40; no sale recorded 2025-02-28: US$1547.26; no sale recorded 2025-03-10: US$1968.08; no sale recorded 2025-03-14: US$1831.95; no sale recorded 2025-04-06: US$1947.00; no sale recorded 2025-04-14: US$1950.00; no sale recorded 2025-04-20: US$74.09; no sale recorded 2025-04-22: US$1262.60; sold recorded 2025-05-19: US$1960.00; no sale recorded 2025-05-20: US$1857.80; no sale recorded 2025-06-04: US$1705.99; no sale recorded 2025-06-06: US$1965.21; no sale recorded 2025-06-06: US$1700.00; no sale recorded 2025-06-07: US$1914.92; no sale recorded 2025-06-17: US$1893.32; no sale recorded 2025-06-17: US$1550.19; no sale recorded 2025-06-25: US$2025.00; no sale recorded 2025-06-30: US$1814.26; no sale recorded 2025-07-02: US$1922.72; no sale recorded 2025-07-02: US$1643.61; no sale recorded 2025-07-10: US$1762.78; no sale recorded 2025-07-17: US$1550.17; no sale recorded 2025-07-21: US$1896.20; no sale recorded 2025-07-31: US$1454.97; no sale recorded 2025-08-02: US$2082.55; no sale recorded 2025-08-05: US$2035.70; no sale recorded 2025-08-19: US$1960.00; no sale recorded 2025-08-28: US$1954.00; no sale recorded 2025-09-02: US$1490.75; no sale recorded 2025-09-04: US$1895.48; no sale recorded 2025-09-05: US$2032.00; no sale recorded 2025-09-12: US$1550.58; no sale recorded 2025-09-12: US$1550.58; no sale recorded 2025-09-15: US$1858.68; no sale recorded 2025-09-17: US$1550.18; no sale recorded 2025-09-23: US$1551.31; no sale recorded 2025-09-25: US$1886.22; no sale recorded 2025-09-26: US$1550.64; no sale recorded 2025-09-27: US$1551.22; no sale recorded 2025-09-27: US$1550.30; no sale recorded 2025-09-28: US$1550.42; no sale recorded 2025-10-21: US$1914.22; no sale recorded 2025-10-31: US$1953.71; no sale recorded 2025-10-31: US$2050.00; no sale recorded 2025-11-07: US$1838.74; no sale recorded 2025-11-30: US$1252.85; no sale recorded 2025-12-01: US$1844.85; no sale recorded 2025-12-12: US$1705.63; no sale recorded 2025-12-12: US$1705.63; no sale recorded 2025-12-22: US$1891.69; no sale recorded 2025-12-24: US$1191.60; no sale recorded 2025-12-30: US$2305.72; no sale recorded 2025-12-30: US$1185.03; no sale recorded 2026-01-10: US$898.69; no sale recorded 2026-01-14: US$898.69; no sale recorded 2026-01-22: US$898.69; no sale recorded 2026-01-22: US$2046.00; no sale recorded 2026-01-26: US$1750.26; no sale recorded 2026-01-27: US$1828.82; no sale recorded 2026-01-28: US$1751.16; no sale recorded 2026-02-06: US$2600.00; no sale recorded 2026-02-15: US$865.44; no sale recorded 2026-02-21: US$865.44; no sale recorded 2026-02-26: US$865.44; no sale recorded 2026-03-03: US$865.44; no sale recorded 2026-03-08: US$865.44; no sale recorded 2026-03-11: US$865.44; no sale recorded 2026-03-17: US$1751.71; no sale recorded 2026-03-18: US$2119.56; no sale recorded 2026-03-24: US$1525.00; no sale recorded 2026-03-25: US$2025.00; no sale recorded 2026-03-27: US$865.44; no sale recorded 2026-04-02: US$1750.16; no sale recorded 2026-04-03: US$1749.99; no sale recorded 2026-04-09: US$865.44; no sale recorded 2026-04-11: US$1751.70; no sale recorded 2026-04-19: US$865.44; no sale recorded 2026-04-21: US$695.00; no sale recorded 2026-04-22: US$865.44; no sale recorded 2026-04-23: US$1750.16; no sale recorded 2026-04-26: US$865.44; no sale recorded 2026-05-03: US$155.87; no sale recorded 2026-05-03: US$58.77; no sale recorded 2026-05-22: US$1961.92; no sale recorded 2026-05-25: US$1899.93; no sale recorded 2026-05-28: US$1899.88; no sale recorded 2026-06-03: US$1899.81; no sale recorded 2026-06-04: US$2336.91; no sale recorded 2026-06-08: US$2038.00; no sale recorded 2026-06-15: US$1439.32; no sale recorded 2026-06-15: US$1881.00; no sale recorded 2026-06-16: US$1899.91; no sale recorded 2026-06-16: US$2307.01; no sale recorded 2026-06-18: US$2279.98; no sale recorded 2026-07-03: US$1899.97; no sale recorded 2026-09-15: US$2397.70; no sale recorded 2026-09-21: US$2397.70; no sale recorded 2026-09-28: US$1218.00; no sale recorded 2026-10-23: US$1621.20; no sale recorded Sold recorded No sale recorded Monthly median
Logarithmic price scale (price + 1). Dates are listing starts.
Median recorded price, all years $1649.00 238 plotted records from 238 US-dollar records in this range. Monthly medians use all records in each calendar month.