| Year | Count |
|---|---|
| 1991 | 10 |
| 1995 | 19 |
| 1996 | 20 |
| 1997 | 21 |
| 1998 | 50 |
| 1999 | 20 |
| 2000 | 92 |
| 2001 | 158 |
| 2002 | 182 |
| 2003 | 148 |
| 2004 | 324 |
| 2005 | 405 |
| 2006 | 316 |
| 2007 | 285 |
| 2008 | 369 |
| 2009 | 204 |
| 2010 | 133 |
| 2011 | 170 |
| 2012 | 151 |
| 2013 | 68 |
| 2014 | 262 |
| 2015 | 263 |
| 2016 | 235 |
| 2017 | 251 |
| 2018 | 163 |
| 2019 | 128 |
| 2020 | 114 |
| 2021 | 91 |
| 2022 | 72 |
| 2023 | 131 |
| 2024 | 149 |