- 1947 to 1949 2
- 1950 to 1954 2
- 1955 to 1959 2
- 1960 to 1964 28
- 1965 to 1969 11
- 1970 to 1974 60
- 1975 to 1979 66
- 1980 to 1984 201
- 1985 to 1989 442
- 1990 to 1994 608
- 1995 to 1999 1,060
- 2000 to 2004 4,041
- 2005 to 2009 5,760
- 2010 to 2014 5,235
- 2015 to 2019 5,995