Year	Millions Of Dollars
1918	30579.0
1919	36408.0
1920	36217.0
1921	28177.0
1922	30480.0
1923	33619.0
1924	33466.0
1925	35202.0
1926	34963.0
1927	34824.0
1928	34678.0
1929	36252.0
1930	29695.0
1931	23748.0
1932	19097.0
1933	21013.0
1934	22402.0
1935	24195.0
1936	26935.0
1937	29504.0
1938	27487.0