| Year | Count |
|---|---|
| 1986 | 7 |
| 1987 | 5 |
| 1990 | 12 |
| 1991 | 15 |
| 1992 | 51 |
| 1993 | 46 |
| 1994 | 19 |
| 1995 | 21 |
| 1996 | 20 |
| 1997 | 8 |
| 1998 | 15 |
| 1999 | 36 |
| 2000 | 46 |
| 2001 | 102 |
| 2002 | 41 |
| 2003 | 63 |
| 2004 | 41 |
| 2005 | 105 |
| 2006 | 110 |
| 2007 | 78 |
| 2008 | 193 |
| 2009 | 140 |
| 2010 | 100 |
| 2011 | 85 |
| 2012 | 136 |
| 2013 | 96 |
| 2014 | 51 |
| 2015 | 57 |
| 2016 | 54 |
| 2017 | 92 |
| 2018 | 63 |
| 2019 | 63 |
| 2020 | 52 |
| 2021 | 53 |
| 2022 | 45 |
| 2023 | 46 |
| 2024 | 29 |