- 1947 to 1949 3
- 1950 to 1954 11
- 1955 to 1959 22
- 1960 to 1964 23
- 1965 to 1969 68
- 1970 to 1974 62
- 1975 to 1979 99
- 1980 to 1984 226
- 1985 to 1989 253
- 1990 to 1994 888
- 1995 to 1999 1,522
- 2000 to 2004 781
- 2005 to 2009 1,069
- 2010 to 2014 723
- 2015 to 2018 243