| Year | Count |
|---|---|
| 1989 | 9 |
| 1990 | 16 |
| 1991 | 44 |
| 1992 | 29 |
| 1992 | 97 |
| 1993 | 166 |
| 1994 | 15 |
| 1994 | 150 |
| 1995 | 43 |
| 1995 | 187 |
| 1996 | 30 |
| 1996 | 106 |
| 1997 | 32 |
| 1997 | 77 |
| 1998 | 8 |
| 1998 | 149 |
| 1999 | 26 |
| 1999 | 100 |
| 2000 | 86 |
| 2001 | 20 |
| 2001 | 25 |
| 2002 | 32 |
| 2003 | 28 |
| 2003 | 11 |
| 2004 | 22 |
| 2004 | 36 |
| 2005 | 33 |
| 2005 | 38 |
| 2006 | 5 |
| 2006 | 47 |
| 2007 | 29 |
| 2007 | 32 |
| 2008 | 16 |
| 2008 | 31 |
| 2009 | 5 |
| 2009 | 20 |
| 2010 | 25 |
| 2011 | 10 |
| 2012 | 16 |
| 2013 | 10 |
| 2013 | 10 |
| 2014 | 15 |
| 2014 | 10 |
| 2015 | 36 |
| 2016 | 5 |
| 2017 | 23 |
| 2017 | 21 |
| 2018 | 25 |
| 2019 | 11 |
| 2020 | 6 |
| 2021 | 23 |
| 2022 | 19 |
| 2023 | 16 |
| 2024 | 8 |