- 1921 to 1924 29,411
- 1925 to 1929 32,939
- 1930 to 1934 36,390
- 1935 to 1939 39,389
- 1940 to 1944 44,364
- 1945 to 1949 47,404
- 1950 to 1954 50,686
- 1955 to 1959 51,677
- 1960 to 1964 58,818
- 1965 to 1969 72,573
- 1970 to 1974 72,510
- 1975 to 1979 70,659
- 1980 to 1984 64,706
- 1985 to 1989 63,017