Year	Millions Of Dollars
1916	576.700
1917	962.900
1918	684.700
1919	848.300
1920	933.300
1921	739.300
1922	887.800
1923	868.100
1924	995.100
1925	1523.80
1926	1336.90
1927	1522.80
1928	1971.30
1929	2197.50
1930	1064.80
1931	570.500
1932	288.000
1933	260.600
1934	452.400
1935	603.300
1936	539.500
1937	458.800
1938	488.500
1939	498.600
1940	520.400