| Year | Count |
|---|---|
| 1989 | 7 |
| 1992 | 9 |
| 1993 | 8 |
| 1994 | 6 |
| 1996 | 8 |
| 1997 | 9 |
| 1998 | 10 |
| 1999 | 7 |
| 2000 | 8 |
| 2001 | 8 |
| 2002 | 16 |
| 2003 | 11 |
| 2004 | 15 |
| 2005 | 23 |
| 2006 | 33 |
| 2007 | 34 |
| 2008 | 30 |
| 2009 | 39 |
| 2010 | 41 |
| 2011 | 42 |
| 2012 | 38 |
| 2013 | 57 |
| 2014 | 51 |
| 2015 | 63 |
| 2016 | 159 |
| 2017 | 126 |
| 2018 | 38 |
| 2019 | 86 |
| 2020 | 100 |
| 2021 | 90 |
| 2022 | 72 |
| 2023 | 70 |
| 2024 | 74 |