Month	Millions Of Man-Hours
1921-07-01	14.8400
1921-08-01	14.0700
1921-09-01	14.8700
1921-10-01	16.3100
1921-11-01	14.5100
1921-12-01	12.7200
1922-01-01	13.9300
1922-02-01	13.3800
1922-03-01	13.2600
1922-04-01	12.0500
1922-05-01	13.2900
1922-06-01	13.6900
1922-07-01	23.1100
1922-08-01	35.1100
1922-09-01	41.9700
1922-10-01	40.0600
1922-11-01	34.5400
1922-12-01	33.5700
1923-01-01	31.3800
1923-02-01	29.2200
1923-03-01	28.2100
1923-04-01	26.0200
1923-05-01	28.3900
1923-06-01	27.6000
1923-07-01	29.1300
1923-08-01	27.8100
1923-09-01	27.9700
1923-10-01	27.1800
1923-11-01	22.7900
1923-12-01	18.9200
1924-01-01	20.2400
1924-02-01	20.8200
1924-03-01	18.3900
1924-04-01	15.8300
1924-05-01	16.6100
1924-06-01	15.7800
1924-07-01	16.2800
1924-08-01	16.9300
1924-09-01	18.2500
1924-10-01	18.4900
1924-11-01	17.8600
1924-12-01	18.0800
1925-01-01	20.0800
1925-02-01	16.7200
1925-03-01	14.9900
1925-04-01	13.8200
1925-05-01	16.1500
1925-06-01	15.4700
1925-07-01	17.1700
1925-08-01	17.7900
1925-09-01	18.6900
1925-10-01	20.0600
1925-11-01	19.8500
1925-12-01	18.0900
1926-01-01	18.4200
1926-02-01	19.1100
1926-03-01	16.9100
1926-04-01	15.6400
1926-05-01	17.8800
1926-06-01	17.1100
1926-07-01	19.0300
1926-08-01	19.6300
1926-09-01	21.7900
1926-10-01	22.1700
1926-11-01	20.3800
1926-12-01	19.6000
1927-01-01	18.7100
1927-02-01	16.3600
1927-03-01	14.9100
1927-04-01	15.4600
1927-05-01	18.0400
1927-06-01	16.3300
1927-07-01	17.6000
1927-08-01	17.0700
1927-09-01	17.8800
1927-10-01	17.5500
1927-11-01	15.3100
1927-12-01	14.7600
1928-01-01	14.7000
1928-02-01	12.6000
1928-03-01	12.5300
1928-04-01	12.5000
1928-05-01	14.0900
1928-06-01	13.7800
1928-07-01	15.6800
1928-08-01	15.7200
1928-09-01	16.9600
1928-10-01	16.6200
1928-11-01	14.5100
1928-12-01	13.5200
1929-01-01	14.8500
1929-02-01	14.5300
1929-03-01	13.9600
1929-04-01	12.9300
1929-05-01	15.2200
1929-06-01	15.3700
1929-07-01	16.6900
1929-08-01	16.5600
1929-09-01	17.3900
1929-10-01	16.9300
1929-11-01	13.7100
1929-12-01	14.8600
1930-01-01	13.6500
1930-02-01	10.7600
1930-03-01	10.7400
1930-04-01	10.0100
1930-05-01	11.4400
1930-06-01	10.2900
1930-07-01	10.4000
1930-08-01	10.2900
1930-09-01	10.0500
1930-10-01	9.59000
1930-11-01	8.81000
1930-12-01	7.78000
1931-01-01	7.53000
1931-02-01	6.89000
1931-03-01	7.69000
1931-04-01	6.61000
1931-05-01	7.48000
1931-06-01	6.61000
1931-07-01	7.37000
1931-08-01	6.87000
1931-09-01	6.68000
1931-10-01	6.09000
1931-11-01	5.91000
1931-12-01	5.37000
1932-01-01	5.68000
1932-02-01	5.28000
1932-03-01	5.38000
1932-04-01	4.12000
1932-05-01	4.62000
1932-06-01	3.98000
1932-07-01	4.61000
1932-08-01	4.14000
1932-09-01	4.85000
1932-10-01	5.14000
1932-11-01	4.51000
1932-12-01	5.11000
1933-01-01	4.18000
1933-02-01	4.65000
1933-03-01	3.54000
1933-04-01	3.62000
1933-05-01	4.24000
1933-06-01	4.13000
1933-07-01	5.16000
1933-08-01	4.72000
1933-09-01	5.09000
1933-10-01	4.55000
1933-11-01	4.20000
1933-12-01	5.08000
1934-01-01	4.62000
1934-02-01	6.44000
1934-03-01	5.20000
1934-04-01	4.07000
1934-05-01	4.54000
1934-06-01	4.51000
1934-07-01	5.04000
1934-08-01	4.64000
1934-09-01	5.22000
1934-10-01	4.67000
1934-11-01	4.23000
1934-12-01	4.95000
1935-01-01	6.44000
1935-02-01	5.07000
1935-03-01	4.57000
1935-04-01	3.94000
1935-05-01	4.63000
1935-06-01	5.38000
1935-07-01	5.48000
1935-08-01	5.23000
1935-09-01	5.87000
1935-10-01	5.55000
1935-11-01	5.03000
1935-12-01	6.18000
1936-01-01	7.74000
1936-02-01	10.9000
1936-03-01	7.63000
1936-04-01	5.71000
1936-05-01	6.02000
1936-06-01	5.45000
1936-07-01	6.71000
1936-08-01	6.54000
1936-09-01	6.96000
1936-10-01	7.13000
1936-11-01	6.90000
1936-12-01	7.10000
1937-01-01	8.86000
1937-02-01	8.58000
1937-03-01	6.96000
1937-04-01	6.17000
1937-05-01	7.09000
1937-06-01	6.75000
1937-07-01	7.52000
1937-08-01	6.91000
1937-09-01	6.91000
1937-10-01	6.53000
1937-11-01	5.39000
1937-12-01	5.54000
1938-01-01	5.40000
1938-02-01	4.70000
1938-03-01	4.69000
1938-04-01	4.07000
1938-05-01	4.20000
1938-06-01	4.06000
1938-07-01	4.82000
1938-08-01	4.48000
1938-09-01	5.80000
1938-10-01	5.84000
1938-11-01	5.20000
1938-12-01	4.88000
1939-01-01	5.24000
1939-02-01	4.98000
1939-03-01	4.54000
1939-04-01	4.15000
1939-05-01	4.50000
1939-06-01	4.58000
1939-07-01	5.28000
1939-08-01	5.01000
1939-09-01	6.25000
1939-10-01	6.51000
1939-11-01	5.66000
1939-12-01	5.62000
1940-01-01	7.36000
1940-02-01	6.16000
1940-03-01	5.04000
1940-04-01	4.53000
1940-05-01	5.06000
1940-06-01	5.18000
1940-07-01	5.77000
1940-08-01	6.21000
1940-09-01	6.69000
1940-10-01	6.34000
1940-11-01	6.52000
1940-12-01	7.06000
1941-01-01	7.21000
1941-02-01	6.62000
1941-03-01	7.78000
1941-04-01	6.26000
1941-05-01	7.86000
1941-06-01	8.92000
1941-07-01	9.64000
1941-08-01	9.98000
1941-09-01	10.2700
1941-10-01	10.5600
1941-11-01	9.60000
1941-12-01	10.0300
1942-01-01	10.8400
1942-02-01	10.0700
1942-03-01	10.7800
1942-04-01	10.4900
1942-05-01	12.5500
1942-06-01	12.1100
1942-07-01	14.6400
1942-08-01	16.3000
1942-09-01	18.4500
1942-10-01	19.8200
1942-11-01	20.1800
1942-12-01	22.0700
1943-01-01	23.5500
1943-02-01	22.2900
1943-03-01	23.8500
1943-04-01	22.6100
1943-05-01	27.2200
1943-06-01	26.4700
1943-07-01	29.4300
1943-08-01	30.9400