| Year | Count |
|---|---|
| 1974 | 5 |
| 1989 | 15 |
| 1992 | 5 |
| 1993 | 5 |
| 1994 | 7 |
| 1995 | 12 |
| 1996 | 6 |
| 1997 | 12 |
| 1998 | 19 |
| 1999 | 11 |
| 2000 | 15 |
| 2001 | 30 |
| 2002 | 43 |
| 2003 | 54 |
| 2004 | 54 |
| 2005 | 28 |
| 2006 | 39 |
| 2007 | 43 |
| 2008 | 46 |
| 2009 | 37 |
| 2010 | 57 |
| 2011 | 71 |
| 2012 | 74 |
| 2013 | 79 |
| 2014 | 60 |
| 2015 | 36 |
| 2016 | 69 |
| 2017 | 65 |
| 2018 | 49 |
| 2019 | 43 |
| 2020 | 44 |
| 2021 | 28 |
| 2022 | 38 |
| 2023 | 25 |
| 2024 | 34 |