Year	Millions Of Dollars
1917	27.50
1918	32.29
1919	34.44
1920	50.62
1921	32.28
1922	35.53
1923	37.61
1924	38.67
1925	39.15
1926	41.58
1927	41.54
1928	41.67
1929	39.82
1930	35.44
1931	25.77
1932	18.07
1933	18.65
1934	21.44
1935	24.91
1936	30.14
1937	33.76
1938	26.89
1939	30.86
1940	36.14
1941	49.07
1942	56.91