| Year | Count |
|---|---|
| 1992 | 5 |
| 1993 | 21 |
| 1994 | 45 |
| 1995 | 7 |
| 1996 | 26 |
| 1997 | 47 |
| 1998 | 82 |
| 1999 | 156 |
| 2000 | 158 |
| 2001 | 206 |
| 2001 | 14 |
| 2002 | 185 |
| 2003 | 245 |
| 2004 | 273 |
| 2005 | 365 |
| 2005 | 6 |
| 2006 | 287 |
| 2007 | 370 |
| 2007 | 15 |
| 2008 | 277 |
| 2009 | 221 |
| 2009 | 5 |
| 2010 | 208 |
| 2010 | 5 |
| 2011 | 181 |
| 2012 | 159 |
| 2013 | 96 |
| 2014 | 55 |
| 2015 | 33 |
| 2016 | 31 |
| 2017 | 13 |
| 2018 | 15 |
| 2019 | 10 |
| 2020 | 9 |
| 2021 | 9 |