| Year | Count |
|---|---|
| 1982 | 5 |
| 1987 | 6 |
| 1989 | 7 |
| 1991 | 10 |
| 1993 | 10 |
| 1994 | 8 |
| 1995 | 26 |
| 1996 | 143 |
| 1997 | 60 |
| 1998 | 110 |
| 1999 | 210 |
| 2000 | 139 |
| 2001 | 99 |
| 2002 | 75 |
| 2003 | 104 |
| 2004 | 92 |
| 2005 | 75 |
| 2006 | 58 |
| 2007 | 61 |
| 2008 | 49 |
| 2009 | 38 |
| 2010 | 30 |
| 2011 | 34 |
| 2012 | 21 |
| 2013 | 21 |
| 2014 | 12 |
| 2015 | 30 |
| 2016 | 42 |
| 2018 | 16 |
| 2019 | 18 |
| 2020 | 16 |
| 2021 | 8 |
| 2022 | 16 |
| 2023 | 12 |
| 2024 | 10 |