| Year | Count |
|---|---|
| 1991 | 20 |
| 1992 | 10 |
| 1993 | 7 |
| 1994 | 35 |
| 1995 | 50 |
| 1996 | 177 |
| 1997 | 111 |
| 1998 | 78 |
| 1999 | 73 |
| 2000 | 69 |
| 2001 | 69 |
| 2002 | 46 |
| 2003 | 51 |
| 2004 | 102 |
| 2005 | 92 |
| 2006 | 63 |
| 2007 | 94 |
| 2008 | 108 |
| 2009 | 70 |
| 2010 | 55 |
| 2011 | 36 |
| 2012 | 52 |
| 2013 | 22 |
| 2014 | 38 |
| 2015 | 32 |
| 2016 | 6 |
| 2017 | 28 |
| 2018 | 22 |
| 2019 | 28 |
| 2020 | 5 |
| 2021 | 15 |
| 2022 | 18 |
| 2023 | 29 |
| 2024 | 12 |