1919 0.928000 1920 0.977000 1921 0.948000 1922 1.01900 1923 1.12000 1924 1.23700 1925 1.37300 1926 1.50600 1927 1.63100 1928 1.74300 1929 1.83800 1930 1.88800 1931 1.89500 1932 1.89000 1933 1.88700 1934 1.88800 1935 1.88500 1936 1.90000 1937 1.94000 1938 1.94000 1939 1.98000 1940 2.04000 1941 2.15000 1942 2.27000 1943 2.42000 1944 2.56000 1945 2.71000 1946 2.92000