| Year | Count |
|---|---|
| 1963 | 10 |
| 1967 | 10 |
| 1971 | 10 |
| 1972 | 18 |
| 1973 | 10 |
| 1975 | 10 |
| 1976 | 10 |
| 1977 | 18 |
| 1978 | 22 |
| 1979 | 26 |
| 1980 | 16 |
| 1981 | 28 |
| 1982 | 36 |
| 1983 | 40 |
| 1984 | 36 |
| 1985 | 16 |
| 1986 | 34 |
| 1987 | 30 |
| 1988 | 32 |
| 1989 | 32 |
| 1990 | 46 |
| 1991 | 44 |
| 1992 | 65 |
| 1993 | 28 |
| 1994 | 32 |
| 1995 | 30 |
| 1996 | 32 |
| 1997 | 34 |
| 1998 | 24 |
| 1999 | 36 |
| 2000 | 18 |
| 2001 | 28 |
| 2002 | 16 |
| 2003 | 26 |
| 2004 | 28 |
| 2005 | 36 |
| 2006 | 20 |
| 2007 | 30 |
| 2008 | 20 |
| 2009 | 12 |
| 2010 | 12 |
| 2011 | 12 |
| 2012 | 16 |
| 2014 | 12 |
| 2018 | 12 |