| Year | Count |
|---|---|
| 1992 | 5 |
| 1993 | 16 |
| 1994 | 35 |
| 1995 | 39 |
| 1996 | 56 |
| 1997 | 76 |
| 1998 | 98 |
| 1999 | 104 |
| 2000 | 156 |
| 2001 | 231 |
| 2002 | 149 |
| 2003 | 249 |
| 2004 | 245 |
| 2005 | 313 |
| 2006 | 297 |
| 2007 | 343 |
| 2008 | 288 |
| 2009 | 306 |
| 2010 | 337 |
| 2011 | 353 |
| 2012 | 256 |
| 2013 | 258 |
| 2014 | 156 |
| 2015 | 186 |
| 2016 | 102 |
| 2017 | 70 |
| 2018 | 53 |
| 2019 | 26 |
| 2020 | 64 |
| 2021 | 26 |
| 2022 | 12 |
| 2023 | 5 |