| Year | Count |
|---|---|
| 1985 | 5 |
| 1986 | 18 |
| 1987 | 31 |
| 1988 | 35 |
| 1989 | 52 |
| 1990 | 43 |
| 1991 | 58 |
| 1992 | 53 |
| 1993 | 76 |
| 1994 | 55 |
| 1995 | 49 |
| 1996 | 46 |
| 1997 | 52 |
| 1998 | 50 |
| 1999 | 43 |
| 2000 | 51 |
| 2001 | 44 |
| 2002 | 53 |
| 2003 | 43 |
| 2004 | 37 |
| 2005 | 41 |
| 2006 | 42 |
| 2007 | 55 |
| 2008 | 46 |
| 2009 | 43 |
| 2010 | 43 |
| 2011 | 32 |
| 2012 | 32 |
| 2013 | 30 |
| 2014 | 21 |
| 2015 | 48 |
| 2016 | 36 |
| 2017 | 30 |
| 2018 | 16 |
| 2019 | 16 |
| 2020 | 10 |
| 2022 | 14 |