| Year | Count |
|---|---|
| 1986 | 12 |
| 1988 | 12 |
| 1989 | 10 |
| 1990 | 10 |
| 1991 | 6 |
| 1992 | 7 |
| 1993 | 7 |
| 1994 | 20 |
| 1995 | 28 |
| 1996 | 15 |
| 1997 | 30 |
| 1998 | 40 |
| 1999 | 63 |
| 2000 | 55 |
| 2001 | 77 |
| 2002 | 60 |
| 2003 | 67 |
| 2004 | 37 |
| 2005 | 56 |
| 2006 | 52 |
| 2007 | 49 |
| 2008 | 59 |
| 2009 | 62 |
| 2010 | 71 |
| 2011 | 43 |
| 2012 | 98 |
| 2013 | 63 |
| 2014 | 54 |
| 2015 | 71 |
| 2016 | 41 |
| 2017 | 32 |
| 2018 | 20 |
| 2019 | 25 |
| 2020 | 26 |
| 2021 | 30 |
| 2022 | 10 |
| 2023 | 21 |
| 2024 | 20 |