| Year | Count |
|---|---|
| 1985 | 9 |
| 1986 | 9 |
| 1987 | 11 |
| 1990 | 9 |
| 1991 | 8 |
| 1993 | 10 |
| 1994 | 7 |
| 1995 | 6 |
| 1996 | 11 |
| 1997 | 7 |
| 1998 | 19 |
| 1999 | 13 |
| 2001 | 15 |
| 2002 | 9 |
| 2003 | 12 |
| 2004 | 12 |
| 2005 | 11 |
| 2006 | 14 |
| 2007 | 22 |
| 2008 | 22 |
| 2009 | 28 |
| 2010 | 29 |
| 2011 | 29 |
| 2012 | 30 |
| 2013 | 41 |
| 2014 | 84 |
| 2015 | 68 |
| 2016 | 135 |
| 2017 | 150 |
| 2018 | 120 |
| 2019 | 134 |
| 2020 | 128 |
| 2021 | 124 |
| 2022 | 82 |
| 2023 | 62 |
| 2024 | 86 |