| Year | Count |
|---|---|
| 1991 | 5 |
| 1992 | 21 |
| 1993 | 9 |
| 1994 | 69 |
| 1995 | 75 |
| 1996 | 61 |
| 1997 | 123 |
| 1998 | 126 |
| 1999 | 75 |
| 2000 | 122 |
| 2001 | 168 |
| 2002 | 135 |
| 2003 | 73 |
| 2004 | 138 |
| 2005 | 92 |
| 2006 | 55 |
| 2007 | 63 |
| 2008 | 114 |
| 2009 | 124 |
| 2010 | 77 |
| 2011 | 74 |
| 2012 | 42 |
| 2013 | 26 |
| 2014 | 105 |
| 2015 | 40 |
| 2016 | 17 |
| 2017 | 23 |
| 2018 | 15 |
| 2019 | 42 |
| 2020 | 5 |
| 2021 | 40 |
| 2022 | 19 |
| 2023 | 5 |