Year	Millions Of Dollars
1919	36706.0
1920	43319.0
1921	34932.0
1922	36403.0
1923	42724.0
1924	42708.0
1925	44413.0
1926	47399.0
1927	47787.0
1928	48703.0
1929	51521.0
1930	47040.0
1931	39587.0
1932	30721.0
1933	28194.0
1934	32124.0
1935	34998.0
1936	38863.0
1937	43503.0
1938	39693.0
1939	42639.0