- 1947 to 1949 6,272
- 1950 to 1954 15,048
- 1955 to 1959 13,729
- 1960 to 1964 15,480
- 1965 to 1969 15,786
- 1970 to 1974 17,984
- 1975 to 1979 21,240
- 1980 to 1984 14,969
- 1985 to 1989 13,302
- 1990 to 1994 9,637
- 1995 to 1999 4,913
- 2000 to 2004 3,961
- 2005 to 2007 2,326