| Year | Count |
|---|---|
| 1972 | 9 |
| 1973 | 10 |
| 1974 | 7 |
| 1975 | 9 |
| 1977 | 8 |
| 1978 | 5 |
| 1991 | 5 |
| 1992 | 12 |
| 1993 | 8 |
| 1994 | 5 |
| 1994 | 7 |
| 1995 | 7 |
| 1995 | 11 |
| 1996 | 8 |
| 1996 | 5 |
| 1997 | 5 |
| 1997 | 9 |
| 1998 | 7 |
| 1998 | 11 |
| 1999 | 10 |
| 2000 | 7 |
| 2000 | 8 |
| 2001 | 11 |
| 2002 | 8 |
| 2002 | 7 |
| 2003 | 5 |
| 2003 | 6 |
| 2004 | 6 |
| 2004 | 7 |
| 2005 | 10 |
| 2006 | 11 |
| 2006 | 8 |
| 2008 | 9 |
| 2009 | 6 |
| 2010 | 7 |
| 2010 | 10 |
| 2011 | 8 |
| 2011 | 6 |
| 2012 | 5 |
| 2012 | 7 |
| 2014 | 5 |
| 2016 | 15 |
| 2017 | 10 |
| 2023 | 10 |