| Year | Count |
|---|---|
| 1991 | 5 |
| 1994 | 6 |
| 1995 | 6 |
| 1996 | 16 |
| 1997 | 6 |
| 1998 | 11 |
| 1999 | 22 |
| 2000 | 23 |
| 2001 | 28 |
| 2002 | 28 |
| 2003 | 20 |
| 2004 | 15 |
| 2005 | 35 |
| 2006 | 52 |
| 2007 | 84 |
| 2008 | 36 |
| 2009 | 108 |
| 2010 | 90 |
| 2011 | 88 |
| 2012 | 96 |
| 2013 | 141 |
| 2014 | 150 |
| 2015 | 219 |
| 2016 | 283 |
| 2017 | 285 |
| 2018 | 267 |
| 2019 | 230 |
| 2020 | 277 |
| 2021 | 362 |
| 2022 | 335 |
| 2023 | 258 |
| 2024 | 240 |