| Year | Count |
|---|---|
| 1986 | 5 |
| 1988 | 6 |
| 1989 | 8 |
| 1990 | 18 |
| 1991 | 13 |
| 1992 | 16 |
| 1993 | 9 |
| 1994 | 20 |
| 1995 | 13 |
| 1996 | 19 |
| 1997 | 27 |
| 1998 | 38 |
| 1999 | 42 |
| 2000 | 47 |
| 2001 | 55 |
| 2002 | 71 |
| 2003 | 71 |
| 2004 | 66 |
| 2005 | 75 |
| 2006 | 64 |
| 2007 | 78 |
| 2008 | 78 |
| 2009 | 73 |
| 2010 | 72 |
| 2011 | 78 |
| 2012 | 67 |
| 2013 | 58 |
| 2014 | 65 |
| 2015 | 56 |
| 2016 | 207 |
| 2017 | 171 |
| 2018 | 57 |
| 2019 | 90 |
| 2020 | 76 |
| 2021 | 56 |
| 2022 | 80 |
| 2023 | 68 |
| 2024 | 90 |