| Year | Count |
|---|---|
| 1981 | 15 |
| 1985 | 5 |
| 1992 | 5 |
| 1995 | 6 |
| 1996 | 8 |
| 1997 | 6 |
| 1998 | 7 |
| 1999 | 17 |
| 2000 | 15 |
| 2001 | 32 |
| 2002 | 40 |
| 2003 | 22 |
| 2004 | 47 |
| 2005 | 33 |
| 2006 | 40 |
| 2007 | 47 |
| 2008 | 34 |
| 2009 | 39 |
| 2010 | 51 |
| 2011 | 44 |
| 2012 | 43 |
| 2013 | 32 |
| 2014 | 40 |
| 2015 | 53 |
| 2016 | 60 |
| 2017 | 63 |
| 2018 | 45 |
| 2019 | 41 |
| 2020 | 36 |
| 2021 | 33 |
| 2022 | 40 |
| 2023 | 54 |
| 2024 | 49 |