Month	Hours
1920-06-01	63.2000
1920-07-01	64.8000
1920-08-01	66.1000
1920-09-01	62.8000
1920-10-01	63.3000
1920-11-01	59.0000
1920-12-01	63.5000
1921-01-01	55.7000
1921-02-01	50.6000
1921-03-01	54.0000
1921-04-01	53.7000
1921-05-01	47.3000
1921-06-01	49.5000
1921-07-01	53.3000
1921-08-01	55.1000
1921-09-01	54.2000
1921-10-01	60.9000
1921-11-01	56.6000
1921-12-01	58.0000
1922-07-01	53.6000
1922-08-01	58.8000
1922-09-01	60.1000
1922-10-01	58.5000
1922-11-01	59.1000
1922-12-01	58.3000
1923-01-01	61.3000
1923-02-01	60.2000
1923-03-01	60.4000
1923-04-01	60.2000
1923-05-01	60.0000
1923-06-01	59.3000
1923-07-01	61.9000
1923-08-01	57.0000
1923-09-01	51.4000
1923-10-01	53.3000
1923-11-01	50.5000
1923-12-01	56.8000
1924-01-01	55.9000
1924-02-01	54.6000
1924-03-01	51.1000
1924-04-01	51.9000
1924-05-01	50.2000
1924-06-01	47.3000
1924-07-01	46.6000
1924-08-01	48.6000
1924-09-01	49.8000
1924-10-01	52.4000
1924-11-01	51.6000
1924-12-01	55.2000
1925-01-01	56.0000
1925-02-01	53.5000
1925-03-01	54.6000
1925-04-01	53.0000
1925-05-01	51.4000
1925-06-01	51.3000
1925-07-01	52.4000
1925-08-01	51.8000
1925-09-01	54.9000
1925-10-01	54.4000
1925-11-01	54.7000
1925-12-01	55.6000
1926-01-01	54.8000
1926-02-01	55.1000
1926-03-01	55.5000
1926-04-01	53.7000
1926-05-01	54.7000
1926-06-01	53.3000
1926-07-01	53.1000
1926-08-01	54.2000
1926-09-01	55.5000
1926-10-01	54.8000
1926-11-01	54.4000
1926-12-01	53.5000
1927-01-01	54.0000
1927-02-01	55.6000
1927-03-01	55.2000
1927-04-01	53.4000
1927-05-01	54.3000
1927-06-01	52.1000
1927-07-01	50.8000
1927-08-01	53.1000
1927-09-01	53.2000
1927-10-01	51.7000
1927-11-01	52.6000
1927-12-01	50.8000
1928-01-01	54.5000
1928-02-01	53.5000
1928-03-01	53.7000
1928-04-01	55.4000
1928-05-01	54.6000
1928-06-01	52.8000
1928-07-01	51.9000
1928-08-01	53.8000
1928-09-01	54.8000
1928-10-01	55.0000
1928-11-01	55.8000
1928-12-01	52.5000
1929-01-01	56.0000
1929-02-01	55.4000
1929-03-01	55.7000
1929-04-01	55.6000
1929-05-01	55.2000
1929-06-01	55.7000
1929-07-01	54.8000
1929-08-01	54.9000
1929-09-01	55.5000
1929-10-01	56.4000
1929-11-01	52.6000
1929-12-01	51.0000
1930-01-01	52.9000
1930-02-01	54.5000
1930-03-01	52.0000
1930-04-01	52.5000
1930-05-01	50.1000
1930-06-01	50.0000
1930-07-01	47.0000
1930-08-01	47.2000
1930-09-01	46.7000
1930-10-01	46.9000
1930-11-01	45.0000
1930-12-01	41.8000
1931-01-01	45.3000
1931-02-01	45.6000
1931-03-01	45.5000
1931-04-01	44.5000
1931-05-01	42.3000
1931-06-01	42.6000
1931-07-01	44.5000
1931-08-01	41.0000
1931-09-01	42.8000
1931-10-01	41.8000
1931-11-01	44.5000
1931-12-01	40.9000
1932-01-01	29.8000
1932-02-01	29.9000
1932-03-01	28.8000
1932-04-01	27.9000
1932-05-01	26.7000
1932-06-01	26.6000
1932-07-01	24.6000
1932-08-01	24.2000
1932-09-01	27.1000
1932-10-01	27.9000
1932-11-01	28.7000
1932-12-01	24.3000
1933-01-01	27.0000
1933-02-01	30.4000
1933-03-01	26.8000
1933-04-01	30.3000
1933-05-01	35.4000
1933-06-01	39.4000
1933-07-01	42.4000
1933-08-01	39.3000
1933-09-01	35.9000
1933-10-01	36.0000
1933-11-01	31.2000
1933-12-01	33.3000
1934-01-01	29.2000
1934-02-01	31.9000
1934-03-01	33.3000
1934-04-01	33.7000
1934-05-01	36.6000
1934-06-01	35.7000
1934-07-01	24.4000
1934-08-01	25.0000
1934-09-01	22.6000
1934-10-01	25.4000
1934-11-01	26.3000
1934-12-01	27.4000
1935-01-01	33.6000
1935-02-01	35.6000
1935-03-01	33.9000
1935-04-01	34.2000
1935-05-01	33.9000
1935-06-01	31.4000
1935-07-01	31.5000
1935-08-01	35.0000
1935-09-01	34.0000
1935-10-01	36.8000
1935-11-01	35.7000
1935-12-01	35.0000
1936-01-01	37.0000
1936-02-01	36.8000
1936-03-01	37.2000
1936-04-01	40.9000
1936-05-01	40.5000
1936-06-01	40.8000
1936-07-01	39.0000
1936-08-01	39.7000
1936-09-01	40.5000
1936-10-01	42.5000
1936-11-01	40.7000
1936-12-01	41.5000
1937-01-01	40.5000
1937-02-01	42.5000
1937-03-01	42.5000
1937-04-01	41.3000
1937-05-01	38.6000
1937-06-01	39.2000
1937-07-01	37.3000
1937-08-01	37.9000
1937-09-01	36.8000
1937-10-01	31.9000
1937-11-01	27.6000
1937-12-01	23.4000
1938-01-01	22.9000
1938-02-01	24.9000
1938-03-01	26.7000
1938-04-01	25.6000
1938-05-01	24.4000
1938-06-01	25.6000
1938-07-01	24.3000
1938-08-01	29.4000
1938-09-01	30.0000
1938-10-01	31.2000
1938-11-01	34.2000
1938-12-01	32.0000
1939-01-01	32.0000
1939-02-01	33.5000
1939-03-01	34.7000
1939-04-01	32.1000
1939-05-01	32.7000
1939-06-01	33.5000
1939-07-01	31.0000
1939-08-01	36.2000
1939-09-01	35.0000
1939-10-01	38.0000
1939-11-01	39.5000
1939-12-01	36.9000
1940-01-01	37.1000
1940-02-01	34.1000
1940-03-01	32.3000
1940-04-01	33.4000
1940-05-01	35.7000
1940-06-01	35.9000
1940-07-01	36.5000
1940-08-01	36.7000
1940-09-01	36.5000
1940-10-01	39.4000
1940-11-01	38.2000
1940-12-01	37.6000
1941-01-01	39.2000
1941-02-01	39.4000
1941-03-01	38.5000
1941-04-01	39.4000
1941-05-01	39.7000
1941-06-01	38.2000
1941-07-01	37.8000
1941-08-01	37.2000
1941-09-01	37.8000
1941-10-01	40.0000
1941-11-01	37.6000
1941-12-01	38.2000
1942-01-01	39.2000
1942-02-01	39.0000
1942-03-01	38.1000
1942-04-01	39.7000
1942-05-01	37.7000
1942-06-01	38.7000
1942-07-01	38.4000
1942-08-01	37.6000
1942-09-01	39.8000
1942-10-01	39.9000
1942-11-01	39.4000
1942-12-01	40.2000