| Year | Count |
|---|---|
| 1990 | 7 |
| 1991 | 12 |
| 1992 | 11 |
| 1993 | 30 |
| 1994 | 5 |
| 1995 | 22 |
| 1996 | 5 |
| 1997 | 6 |
| 1998 | 25 |
| 1999 | 30 |
| 2000 | 7 |
| 2001 | 5 |
| 2002 | 7 |
| 2003 | 21 |
| 2004 | 78 |
| 2005 | 129 |
| 2006 | 114 |
| 2007 | 79 |
| 2008 | 40 |
| 2009 | 92 |
| 2010 | 66 |
| 2011 | 52 |
| 2012 | 44 |
| 2013 | 19 |
| 2014 | 20 |
| 2015 | 32 |
| 2016 | 55 |
| 2017 | 21 |
| 2018 | 31 |
| 2021 | 5 |
| 2024 | 12 |