| Year | Count |
|---|---|
| 1991 | 6 |
| 1994 | 8 |
| 1995 | 6 |
| 1996 | 13 |
| 1997 | 18 |
| 1998 | 20 |
| 1999 | 14 |
| 2000 | 20 |
| 2001 | 15 |
| 2002 | 13 |
| 2003 | 22 |
| 2004 | 21 |
| 2005 | 17 |
| 2006 | 31 |
| 2007 | 37 |
| 2008 | 44 |
| 2009 | 44 |
| 2010 | 45 |
| 2011 | 33 |
| 2012 | 39 |
| 2013 | 40 |
| 2014 | 38 |
| 2015 | 25 |
| 2016 | 99 |
| 2017 | 129 |
| 2018 | 45 |
| 2019 | 94 |
| 2020 | 64 |
| 2021 | 106 |
| 2022 | 86 |
| 2023 | 64 |
| 2024 | 56 |