| Year | Count |
|---|---|
| 1986 | 7 |
| 1989 | 6 |
| 1990 | 8 |
| 1991 | 8 |
| 1992 | 9 |
| 1993 | 12 |
| 1994 | 8 |
| 1995 | 11 |
| 1996 | 17 |
| 1997 | 13 |
| 1998 | 13 |
| 1999 | 20 |
| 2000 | 13 |
| 2001 | 24 |
| 2002 | 16 |
| 2003 | 28 |
| 2004 | 32 |
| 2005 | 34 |
| 2006 | 32 |
| 2007 | 38 |
| 2008 | 40 |
| 2009 | 31 |
| 2010 | 61 |
| 2011 | 38 |
| 2012 | 55 |
| 2013 | 45 |
| 2014 | 49 |
| 2015 | 40 |
| 2016 | 165 |
| 2017 | 165 |
| 2018 | 122 |
| 2019 | 140 |
| 2020 | 98 |
| 2021 | 120 |
| 2022 | 86 |
| 2023 | 150 |
| 2024 | 88 |