- 1937 to 1939 38,326
- 1940 to 1944 44,301
- 1945 to 1949 47,327
- 1950 to 1954 50,497
- 1955 to 1959 51,499
- 1960 to 1964 58,626
- 1965 to 1969 72,320
- 1970 to 1974 72,242
- 1975 to 1979 70,239
- 1980 to 1984 64,339
- 1985 to 1989 62,722
- 1990 to 1994 63,210
- 1995 to 1999 54,559
- 2000 to 2003 40,262