1919 562.200 1920 337.100 1921 135.900 1922 53.4000 1923 42.9000 1924 39.5000 1925 32.7000 1926 50.7000 1927 41.5000 1928 35.4000 1929 45.8000 1930 57.3000 1931 51.7000 1932 33.5000 1933 20.5000 1934 . 1935 30.0000 1936 . 1937 75.0000