| Year | Count |
|---|---|
| 1990 | 13 |
| 1992 | 10 |
| 1993 | 5 |
| 1994 | 10 |
| 1995 | 10 |
| 1996 | 21 |
| 1997 | 21 |
| 1998 | 21 |
| 1999 | 41 |
| 2000 | 67 |
| 2001 | 100 |
| 2002 | 91 |
| 2003 | 105 |
| 2004 | 128 |
| 2005 | 154 |
| 2006 | 202 |
| 2007 | 222 |
| 2008 | 271 |
| 2009 | 222 |
| 2010 | 154 |
| 2011 | 119 |
| 2012 | 106 |
| 2013 | 83 |
| 2014 | 49 |
| 2015 | 92 |
| 2016 | 68 |
| 2017 | 82 |
| 2018 | 73 |
| 2019 | 21 |
| 2020 | 56 |
| 2021 | 37 |
| 2022 | 26 |
| 2023 | 45 |
| 2024 | 67 |