Year	Billions Of Dollars
1919	2.79
1920	3.03
1921	2.43
1922	2.48
1923	2.86
1924	2.90
1925	2.98
1926	3.19
1927	3.42
1928	3.67
1929	4.01
1930	3.93
1931	3.22
1932	2.41
1933	2.11
1934	2.44
1935	2.59
1936	2.76
1937	3.09
1938	2.80