Year	Millions Of Dolllars
1918	22298.0
1919	28007.0
1920	29390.0
1921	23465.0
1922	25049.0
1923	28129.0
1924	27551.0
1925	28659.0
1926	28301.0
1927	27669.0
1928	27795.0
1929	29029.0
1930	24744.0
1931	20311.0
1932	16266.0
1933	17654.0
1934	18153.0
1935	18793.0
1936	21062.0
1937	23197.0