Year	Millions Of Dollars
1918	549.3
1919	1016.6
1920	1100.5
1921	760.6
1922	606.9
1923	731.1
1924	806.7
1925	749.0
1926	690.9
1927	740.0
1928	560.6
1929	754.4
1930	483.0
1931	515.1
1932	421.8
1933	466.0