Year	Millions Of Dollars
1918	10290.0
1919	12564.0
1920	13462.0
1921	10680.0
1922	12099.0
1923	13714.0
1924	13277.0
1925	14015.0
1926	13734.0
1927	13284.0
1928	13359.0
1929	13917.0
1930	12258.0
1931	9856.00
1932	7944.00
1933	8846.00
1934	9158.00
1935	9545.00
1936	11171.0
1937	12553.0
1938	11149.0
1939	12117.0
1940	13541.0
1941	17808.0