Year	Millions Of Dollars
1916	798.900
1917	948.400
1918	567.800
1919	432.600
1920	702.100
1921	185.100
1922	286.400
1923	283.600
1924	240.100
1925	453.600
1926	455.800
1927	276.300
1928	332.700
1929	430.500
1930	194.100
1931	71.2000
1932	62.7000
1933	71.7000
1934	156.100
1935	162.900
1936	236.500
1937	345.100
1938	165.200
1939	213.100
1940	273.900