Monthly Thousands Of Hours
1920-01-01 1725.00
1920-02-01 1626.00
1920-03-01 1782.00
1920-04-01 1513.00
1920-05-01 1545.00
1920-06-01 1556.00
1920-07-01 1583.00
1920-08-01 1481.00
1920-09-01 1613.00
1920-10-01 1254.00
1920-11-01 1454.00
1920-12-01 1586.00
1921-01-01 1365.00
1921-02-01 1188.00
1921-03-01 1161.00
1921-04-01 641.000
1921-05-01 477.000
1921-06-01 530.000
1921-07-01 1008.00
1921-08-01 1221.00
1921-09-01 1169.00
1921-10-01 1192.00
1921-11-01 1271.00
1921-12-01 1235.00
1922-01-01 1215.00
1922-02-01 1184.00
1922-03-01 1317.00
1922-04-01 1080.00
1922-05-01 1206.00
1922-06-01 1048.00
1922-07-01 1176.00
1922-08-01 1269.00
1922-09-01 1302.00
1922-10-01 1350.00
1922-11-01 1429.00
1922-12-01 1324.00
1923-01-01 1427.00
1923-02-01 1337.00
1923-03-01 1463.00
1923-04-01 1303.00
1923-05-01 1365.00
1923-06-01 1341.00
1923-07-01 1316.00
1923-08-01 1355.00
1923-09-01 1354.00
1923-10-01 1526.00
1923-11-01 1567.00
1923-12-01 1522.00
1924-01-01 1325.00
1924-02-01 1638.00
1924-03-01 1672.00
1924-04-01 1457.00
1924-05-01 1475.00
1924-06-01 1232.00
1924-07-01 1427.00
1924-08-01 1338.00
1924-09-01 1454.00
1924-10-01 1560.00
1924-11-01 1461.00
1924-12-01 1509.00
1925-01-01 1553.00
1925-02-01 1409.00
1925-03-01 1471.00
1925-04-01 1298.00
1925-05-01 1308.00
1925-06-01 1226.00
1925-07-01 1515.00
1925-08-01 1288.00
1925-09-01 1373.00
1925-10-01 1512.00
1925-11-01 1524.00
1925-12-01 1674.00
1926-01-01 1590.00
1926-02-01 1514.00
1926-03-01 1640.00
1926-04-01 1416.00
1926-05-01 428.000
1926-06-01 725.000
1926-07-01 791.000
1926-08-01 838.000
1926-09-01 942.000
1926-10-01 1180.00
1926-11-01 1424.00
1926-12-01 1699.00
1927-01-01 1747.00
1927-02-01 1657.00
1927-03-01 1675.00
1927-04-01 1388.00
1927-05-01 1417.00
1927-06-01 1333.00
1927-07-01 1418.00
1927-08-01 1427.00
1927-09-01 1468.00
1927-10-01 1523.00
1927-11-01 1497.00
1927-12-01 1536.00
1928-01-01 1457.00
1928-02-01 1380.00
1928-03-01 1446.00
1928-04-01 1200.00
1928-05-01 1281.00
1928-06-01 1252.00
1928-07-01 1259.00
1928-08-01 1300.00
1928-09-01 1314.00
1928-10-01 1436.00
1928-11-01 1411.00
1928-12-01 1405.00
1929-01-01 1528.00
1929-02-01 1445.00
1929-03-01 1531.00
1929-04-01 1370.00
1929-05-01 1344.00
1929-06-01 1257.00
1929-07-01 1393.00
1929-08-01 1383.00
1929-09-01 1380.00
1929-10-01 1508.00
1929-11-01 1528.00
1929-12-01 1454.00
1930-01-01 1514.00
1930-02-01 1371.00
1930-03-01 1404.00
1930-04-01 1249.00
1930-05-01 1320.00
1930-06-01 1125.00
1930-07-01 1277.00
1930-08-01 1214.00
1930-09-01 1279.00
1930-10-01 1344.00
1930-11-01 1280.00
1930-12-01 1427.00
1931-01-01 1378.00
1931-02-01 1190.00
1931-03-01 1255.00
1931-04-01 1156.00
1931-05-01 1115.00
1931-06-01 1149.00
1931-07-01 1189.00
1931-08-01 1116.00
1931-09-01 1182.00
1931-10-01 1266.00
1931-11-01 1168.00
1931-12-01 1240.00