Year	Millions Of Dollars
1916	536.700
1917	124.800
1918	134.900
1919	162.500
1920	113.600
1921	67.3400
1922	91.7200
1923	112.000
1924	132.700
1925	156.500
1926	162.600
1927	171.200
1928	170.900
1929	178.400
1930	150.500
1931	80.7000
1932	30.7000
1933	23.6000
1934	31.7000
1935	49.3000
1936	68.4000
1937	79.0000
1938	69.1000
1939	64.3000
1940	94.6000