1919 5.45000 1920 5.31000 1921 3.55000 1922 4.18000 1923 5.78000 1924 5.44000 1925 5.96000 1926 6.54000 1927 6.09000 1928 6.50000 1929 7.47000 1930 6.08000 1931 4.12000 1932 2.47000 1933 2.70000 1934 3.40000 1935 4.50000 1936 5.70000 1937 6.60000 1938 4.70000 1939 6.10000