| Year | Count |
|---|---|
| 1985 | 5 |
| 1991 | 8 |
| 1992 | 15 |
| 1993 | 6 |
| 1994 | 7 |
| 1995 | 8 |
| 1996 | 9 |
| 1997 | 6 |
| 1998 | 10 |
| 1999 | 12 |
| 2000 | 14 |
| 2001 | 21 |
| 2002 | 18 |
| 2003 | 34 |
| 2004 | 31 |
| 2005 | 28 |
| 2006 | 41 |
| 2007 | 67 |
| 2008 | 47 |
| 2009 | 59 |
| 2010 | 111 |
| 2011 | 142 |
| 2012 | 151 |
| 2013 | 147 |
| 2014 | 109 |
| 2015 | 88 |
| 2016 | 270 |
| 2017 | 225 |
| 2018 | 219 |
| 2019 | 102 |
| 2020 | 134 |
| 2021 | 108 |
| 2022 | 92 |
| 2023 | 130 |
| 2024 | 108 |