| Year | Count |
|---|---|
| 1963 | 5 |
| 1974 | 5 |
| 1975 | 5 |
| 1975 | 6 |
| 1978 | 6 |
| 1980 | 5 |
| 1983 | 5 |
| 1986 | 6 |
| 1986 | 9 |
| 1987 | 5 |
| 1988 | 6 |
| 1988 | 5 |
| 1989 | 6 |
| 1989 | 9 |
| 1990 | 10 |
| 1990 | 6 |
| 1991 | 5 |
| 1991 | 7 |
| 1992 | 9 |
| 1992 | 6 |
| 1993 | 8 |
| 1993 | 9 |
| 1994 | 8 |
| 1994 | 8 |
| 1995 | 7 |
| 1996 | 5 |
| 1997 | 6 |
| 1998 | 5 |
| 1999 | 5 |
| 1999 | 7 |
| 2002 | 8 |
| 2003 | 7 |
| 2004 | 9 |
| 2005 | 7 |
| 2007 | 5 |
| 2008 | 5 |
| 2009 | 5 |
| 2010 | 5 |
| 2017 | 10 |