Year	Millions Of Dollars
1915	2507.00
1916	3812.00
1917	4813.00
1918	6896.00
1919	6694.00
1920	6927.00
1921	4338.00
1922	4672.00
1923	6211.00
1924	5719.00
1925	7106.00
1926	7945.00
1927	7810.00
1928	8020.00
1929	8848.00
1930	7567.00
1931	5709.00
1932	4477.00
1933	4396.00
1934	5666.00
1935	6485.00
1936	7643.00
1937	9150.00
1938	7001.00
1939	7566.00
1940	8412.00
1941	11621.0
1942	14557.0
1943	18147.0