| Year | Count |
|---|---|
| 1975 | 5 |
| 1993 | 8 |
| 1994 | 9 |
| 1994 | 6 |
| 1995 | 11 |
| 1995 | 6 |
| 1996 | 9 |
| 1996 | 12 |
| 1997 | 13 |
| 1997 | 22 |
| 1998 | 10 |
| 1998 | 25 |
| 1999 | 14 |
| 1999 | 30 |
| 2000 | 8 |
| 2000 | 45 |
| 2001 | 19 |
| 2002 | 5 |
| 2002 | 29 |
| 2003 | 34 |
| 2004 | 38 |
| 2005 | 5 |
| 2005 | 46 |
| 2006 | 6 |
| 2006 | 46 |
| 2007 | 8 |
| 2007 | 43 |
| 2008 | 41 |
| 2009 | 41 |
| 2010 | 46 |
| 2011 | 5 |
| 2011 | 31 |
| 2012 | 5 |
| 2012 | 33 |
| 2013 | 33 |
| 2014 | 26 |
| 2015 | 30 |
| 2016 | 66 |
| 2017 | 72 |
| 2018 | 66 |
| 2019 | 76 |
| 2020 | 48 |
| 2021 | 46 |
| 2022 | 48 |
| 2023 | 40 |
| 2024 | 35 |