| Year | Count |
|---|---|
| 1991 | 10 |
| 1993 | 15 |
| 1994 | 6 |
| 1995 | 11 |
| 1996 | 23 |
| 1997 | 67 |
| 1998 | 86 |
| 1999 | 144 |
| 2000 | 172 |
| 2001 | 209 |
| 2002 | 181 |
| 2003 | 228 |
| 2004 | 375 |
| 2005 | 327 |
| 2006 | 336 |
| 2007 | 286 |
| 2008 | 351 |
| 2009 | 233 |
| 2010 | 272 |
| 2011 | 246 |
| 2012 | 197 |
| 2013 | 172 |
| 2014 | 185 |
| 2015 | 165 |
| 2016 | 139 |
| 2017 | 187 |
| 2018 | 67 |
| 2019 | 45 |
| 2020 | 128 |
| 2021 | 96 |
| 2022 | 114 |
| 2023 | 91 |
| 2024 | 74 |