| Year | Count |
|---|---|
| 1990 | 11 |
| 1991 | 6 |
| 1992 | 8 |
| 1993 | 13 |
| 1994 | 11 |
| 1995 | 17 |
| 1996 | 16 |
| 1997 | 57 |
| 1998 | 127 |
| 1999 | 108 |
| 2000 | 141 |
| 2001 | 116 |
| 2002 | 82 |
| 2003 | 93 |
| 2004 | 46 |
| 2005 | 58 |
| 2006 | 26 |
| 2007 | 60 |
| 2008 | 44 |
| 2009 | 49 |
| 2010 | 87 |
| 2011 | 56 |
| 2012 | 111 |
| 2013 | 165 |
| 2014 | 262 |
| 2015 | 292 |
| 2016 | 295 |
| 2017 | 298 |
| 2018 | 172 |
| 2019 | 185 |
| 2020 | 284 |
| 2021 | 407 |
| 2022 | 341 |
| 2023 | 312 |
| 2024 | 259 |