Year	Dollars
1914	19.1800
1915	18.9100
1916	19.5800
1917	21.0700
1918	24.1100
1919	27.1300
1920	31.0600
1921	31.2700
1922	31.2000
1923	32.5600
1924	33.5800
1925	34.4900
1926	35.3800
1927	35.8800
1928	36.3700
1929	36.9400
1930	37.4800
1931	35.4900
1932	31.8600
1933	31.8500
1934	32.4500
1935	32.7100
1936	33.0500
1937	33.9300
1938	34.1900