Monthly Thousands Of Hours
1920-01-01 1389.00
1920-02-01 1245.00
1920-03-01 1388.00
1920-04-01 1320.00
1920-05-01 1390.00
1920-06-01 1421.00
1920-07-01 1525.00
1920-08-01 1505.00
1920-09-01 1453.00
1920-10-01 1356.00
1920-11-01 1368.00
1920-12-01 1418.00
1921-01-01 1390.00
1921-02-01 1273.00
1921-03-01 1393.00
1921-04-01 1146.00
1921-05-01 847.000
1921-06-01 859.000
1921-07-01 1341.00
1921-08-01 1535.00
1921-09-01 1445.00
1921-10-01 1403.00
1921-11-01 1383.00
1921-12-01 1414.00
1922-01-01 1389.00
1922-02-01 1271.00
1922-03-01 1420.00
1922-04-01 1314.00
1922-05-01 1442.00
1922-06-01 1460.00
1922-07-01 1535.00
1922-08-01 1597.00
1922-09-01 1514.00
1922-10-01 1437.00
1922-11-01 1423.00
1922-12-01 1402.00
1923-01-01 1466.00
1923-02-01 1310.00
1923-03-01 1444.00
1923-04-01 1393.00
1923-05-01 1505.00
1923-06-01 1497.00
1923-07-01 1626.00
1923-08-01 1713.00
1923-09-01 1567.00
1923-10-01 1550.00
1923-11-01 1497.00
1923-12-01 1482.00
1924-01-01 1314.00
1924-02-01 1430.00
1924-03-01 1496.00
1924-04-01 1480.00
1924-05-01 1568.00
1924-06-01 1544.00
1924-07-01 1714.00
1924-08-01 1724.00
1924-09-01 1623.00
1924-10-01 1568.00
1924-11-01 1451.00
1924-12-01 1524.00
1925-01-01 1555.00
1925-02-01 1379.00
1925-03-01 1500.00
1925-04-01 1483.00
1925-05-01 1531.00
1925-06-01 1607.00
1925-07-01 1742.00
1925-08-01 1759.00
1925-09-01 1640.00
1925-10-01 1585.00
1925-11-01 1478.00
1925-12-01 1560.00
1926-01-01 1526.00
1926-02-01 1393.00
1926-03-01 1557.00
1926-04-01 1499.00
1926-05-01 751.000
1926-06-01 1038.00
1926-07-01 1404.00
1926-08-01 1619.00
1926-09-01 1557.00
1926-10-01 1528.00
1926-11-01 1478.00
1926-12-01 1522.00
1927-01-01 1515.00
1927-02-01 1388.00
1927-03-01 1555.00
1927-04-01 1507.00
1927-05-01 1538.00
1927-06-01 1625.00
1927-07-01 1737.00
1927-08-01 1789.00
1927-09-01 1658.00
1927-10-01 1567.00
1927-11-01 1523.00
1927-12-01 1599.00
1928-01-01 1544.00
1928-02-01 1466.00
1928-03-01 1589.00
1928-04-01 1495.00
1928-05-01 1640.00
1928-06-01 1642.00
1928-07-01 1752.00
1928-08-01 1839.00
1928-09-01 1650.00
1928-10-01 1616.00
1928-11-01 1540.00
1928-12-01 1548.00
1929-01-01 1599.00
1929-02-01 1432.00
1929-03-01 1556.00
1929-04-01 1571.00
1929-05-01 1667.00
1929-06-01 1619.00
1929-07-01 1817.00
1929-08-01 1875.00
1929-09-01 1662.00
1929-10-01 1640.00
1929-11-01 1567.00
1929-12-01 1559.00
1930-01-01 1621.00
1930-02-01 1447.00
1930-03-01 1574.00
1930-04-01 1568.00
1930-05-01 1639.00
1930-06-01 1654.00
1930-07-01 1813.00
1930-08-01 1828.00
1930-09-01 1676.00
1930-10-01 1611.00
1930-11-01 1498.00
1930-12-01 1571.00
1931-01-01 1594.00
1931-02-01 1412.00
1931-03-01 1542.00
1931-04-01 1532.00
1931-05-01 1602.00
1931-06-01 1618.00
1931-07-01 1752.00
1931-08-01 1783.00
1931-09-01 1621.00
1931-10-01 1586.00
1931-11-01 1471.00
1931-12-01 1544.00