| Year | Count |
|---|---|
| 1989 | 30 |
| 1991 | 48 |
| 1992 | 20 |
| 1993 | 17 |
| 1994 | 30 |
| 1995 | 32 |
| 1996 | 26 |
| 1997 | 14 |
| 1998 | 31 |
| 1999 | 188 |
| 2000 | 98 |
| 2001 | 88 |
| 2002 | 77 |
| 2003 | 85 |
| 2004 | 119 |
| 2005 | 108 |
| 2006 | 127 |
| 2007 | 86 |
| 2008 | 98 |
| 2009 | 59 |
| 2010 | 59 |
| 2011 | 42 |
| 2012 | 38 |
| 2013 | 22 |
| 2014 | 28 |
| 2015 | 46 |
| 2016 | 18 |
| 2017 | 16 |
| 2018 | 14 |
| 2019 | 36 |
| 2020 | 41 |
| 2021 | 21 |
| 2022 | 33 |
| 2023 | 23 |
| 2024 | 14 |