452 8.3 1906 1250 6.8 1954 20000 8.6 1906 2000 7.7 1956 83000 7.5 1908 2500 7.4 1957 29980 7.5 1915 2000 7.1 1957 100000 8.6 1920 12000 5.8 1960 99330 8.3 1923 5000 8.3 1960 200000 8.3 1927 12230 7.1 1962 70000 7.6 1932 1100 6.0 1963 2990 8.9 1933 114 8.5 1964 115 6.3 1933 2520 6.9 1966 10700 8.4 1934 12000 7.4 1968 30000 7.5 1935 1086 7.4 1970 28000 8.3 1939 66794 7.7 1970 30000 7.9 1939 65 6.5 1971 1300 6.0 1946 5057 6.9 1972 2000 8.4 1946 5000 6.2 1972 5131 7.3 1948 5200 6.3 1974 6000 6.8 1949 2312 6.8 1975 1530 8.7 1950 22778 7.5 1976 1200 7.2 1953 946 6.5 1976