Month	Millions Of Man-Hours
1921-07-01	89.7000
1921-08-01	98.8000
1921-09-01	97.0000
1921-10-01	105.400
1921-11-01	102.200
1921-12-01	98.0000
1922-01-01	90.5000
1922-02-01	83.4000
1922-03-01	97.6000
1922-04-01	89.3000
1922-05-01	95.2000
1922-06-01	98.7000
1922-07-01	52.6000
1922-08-01	82.7000
1922-09-01	104.600
1922-10-01	125.700
1922-11-01	125.200
1922-12-01	126.500
1923-01-01	129.700
1923-02-01	115.800
1923-03-01	131.900
1923-04-01	122.500
1923-05-01	128.400
1923-06-01	126.700
1923-07-01	126.500
1923-08-01	130.100
1923-09-01	119.100
1923-10-01	128.800
1923-11-01	116.700
1923-12-01	108.300
1924-01-01	113.200
1924-02-01	106.000
1924-03-01	114.300
1924-04-01	109.400
1924-05-01	107.500
1924-06-01	99.4000
1924-07-01	102.500
1924-08-01	103.500
1924-09-01	104.700
1924-10-01	115.100
1924-11-01	105.000
1924-12-01	109.300
1925-01-01	112.100
1925-02-01	100.900
1925-03-01	110.900
1925-04-01	105.900
1925-05-01	103.900
1925-06-01	104.200
1925-07-01	105.400
1925-08-01	103.600
1925-09-01	101.200
1925-10-01	109.200
1925-11-01	102.100
1925-12-01	106.300
1926-01-01	105.800
1926-02-01	97.7000
1926-03-01	111.600
1926-04-01	106.100
1926-05-01	104.500
1926-06-01	104.700
1926-07-01	105.300
1926-08-01	106.300
1926-09-01	103.300
1926-10-01	107.800
1926-11-01	103.800
1926-12-01	105.400
1927-01-01	103.800
1927-02-01	94.4000
1927-03-01	106.400
1927-04-01	99.3000
1927-05-01	99.2000
1927-06-01	100.000
1927-07-01	96.8000
1927-08-01	99.8000
1927-09-01	94.7000
1927-10-01	99.1000
1927-11-01	94.3000
1927-12-01	93.7000
1928-01-01	94.0000
1928-02-01	88.9000
1928-03-01	96.9000
1928-04-01	90.4000
1928-05-01	94.4000
1928-06-01	92.2000
1928-07-01	90.7000
1928-08-01	94.7000
1928-09-01	88.0000
1928-10-01	97.4000
1928-11-01	91.5000
1928-12-01	89.8000
1929-01-01	94.2000
1929-02-01	85.8000
1929-03-01	95.7000
1929-04-01	93.7000
1929-05-01	94.7000
1929-06-01	90.3000
1929-07-01	93.5000
1929-08-01	94.5000
1929-09-01	88.7000
1929-10-01	97.2000
1929-11-01	89.9000
1929-12-01	87.5000
1930-01-01	89.7000
1930-02-01	79.8000
1930-03-01	86.4000
1930-04-01	83.4000
1930-05-01	82.9000
1930-06-01	76.5000
1930-07-01	74.7000
1930-08-01	73.5000
1930-09-01	70.9000
1930-10-01	72.8000
1930-11-01	66.5000
1930-12-01	68.7000
1931-01-01	68.9000
1931-02-01	61.9000
1931-03-01	67.9000
1931-04-01	65.8000
1931-05-01	63.6000
1931-06-01	61.3000
1931-07-01	61.2000
1931-08-01	58.5000
1931-09-01	55.5000
1931-10-01	56.3000
1931-11-01	50.8000
1931-12-01	51.7000
1932-01-01	50.6000
1932-02-01	48.8000
1932-03-01	53.2000
1932-04-01	49.1000
1932-05-01	47.6000
1932-06-01	44.3000
1932-07-01	41.5000
1932-08-01	41.9000
1932-09-01	40.8000
1932-10-01	44.3000
1932-11-01	44.1000
1932-12-01	43.6000
1933-01-01	42.7000
1933-02-01	38.1000
1933-03-01	40.7000
1933-04-01	38.6000
1933-05-01	41.2000
1933-06-01	41.8000
1933-07-01	44.7000
1933-08-01	49.4000
1933-09-01	47.2000
1933-10-01	49.5000
1933-11-01	46.4000
1933-12-01	44.5000
1934-01-01	47.3000
1934-02-01	44.0000
1934-03-01	51.7000
1934-04-01	50.3000
1934-05-01	52.9000
1934-06-01	51.4000
1934-07-01	49.8000
1934-08-01	49.8000
1934-09-01	45.6000
1934-10-01	49.4000
1934-11-01	45.7000
1934-12-01	45.5000
1935-01-01	48.5000
1935-02-01	44.8000
1935-03-01	49.8000
1935-04-01	47.9000
1935-05-01	49.2000
1935-06-01	46.7000
1935-07-01	48.3000
1935-08-01	47.9000
1935-09-01	45.8000
1935-10-01	52.0000
1935-11-01	48.7000
1935-12-01	49.9000
1936-01-01	53.2000
1936-02-01	52.6000
1936-03-01	55.8000
1936-04-01	54.7000
1936-05-01	54.9000
1936-06-01	55.4000
1936-07-01	56.9000
1936-08-01	56.4000
1936-09-01	56.8000
1936-10-01	61.0000
1936-11-01	57.2000
1936-12-01	61.1000
1937-01-01	59.4000
1937-02-01	55.8000
1937-03-01	65.4000
1937-04-01	63.6000
1937-05-01	62.9000
1937-06-01	64.0000
1937-07-01	63.1000
1937-08-01	61.2000
1937-09-01	57.5000
1937-10-01	58.2000
1937-11-01	53.7000
1937-12-01	50.7000
1938-01-01	46.8000
1938-02-01	41.8000
1938-03-01	46.6000
1938-04-01	42.4000
1938-05-01	41.0000
1938-06-01	41.2000
1938-07-01	41.9000
1938-08-01	45.2000
1938-09-01	44.7000
1938-10-01	47.4000
1938-11-01	47.0000
1938-12-01	48.2000
1939-01-01	48.8000
1939-02-01	45.2000
1939-03-01	52.4000
1939-04-01	46.6000
1939-05-01	47.8000
1939-06-01	49.6000
1939-07-01	48.8000
1939-08-01	51.5000
1939-09-01	51.1000
1939-10-01	58.5000
1939-11-01	56.7000
1939-12-01	54.6000
1940-01-01	56.2000
1940-02-01	51.4000
1940-03-01	54.2000
1940-04-01	52.7000
1940-05-01	53.3000
1940-06-01	52.3000
1940-07-01	56.2000
1940-08-01	57.4000
1940-09-01	54.4000
1940-10-01	59.8000
1940-11-01	55.3000
1940-12-01	56.0000
1941-01-01	58.6000
1941-02-01	53.6000
1941-03-01	61.2000
1941-04-01	61.8000
1941-05-01	64.8000
1941-06-01	64.4000
1941-07-01	68.0000
1941-08-01	68.4000
1941-09-01	67.3000
1941-10-01	72.1000
1941-11-01	66.6000
1941-12-01	70.2000
1942-01-01	71.0000
1942-02-01	64.2000
1942-03-01	72.8000
1942-04-01	72.5000
1942-05-01	72.9000
1942-06-01	74.7000
1942-07-01	76.7000
1942-08-01	76.8000
1942-09-01	74.6000
1942-10-01	79.5000
1942-11-01	74.5000