| Year | Count |
|---|---|
| 1986 | 8 |
| 1988 | 16 |
| 1990 | 6 |
| 1991 | 12 |
| 1992 | 5 |
| 1994 | 6 |
| 1995 | 26 |
| 1996 | 29 |
| 1997 | 37 |
| 1998 | 54 |
| 1999 | 59 |
| 2000 | 76 |
| 2001 | 60 |
| 2002 | 73 |
| 2003 | 77 |
| 2004 | 117 |
| 2005 | 74 |
| 2006 | 70 |
| 2007 | 34 |
| 2008 | 59 |
| 2009 | 40 |
| 2010 | 22 |
| 2011 | 45 |
| 2012 | 12 |
| 2013 | 28 |
| 2014 | 20 |
| 2015 | 5 |
| 2016 | 20 |
| 2017 | 10 |
| 2018 | 10 |
| 2020 | 5 |
| 2024 | 5 |