| Year | Count |
|---|---|
| 1989 | 5 |
| 1990 | 6 |
| 1991 | 6 |
| 1992 | 13 |
| 1993 | 15 |
| 1994 | 11 |
| 1995 | 13 |
| 1996 | 30 |
| 1997 | 48 |
| 1998 | 70 |
| 1999 | 84 |
| 2000 | 70 |
| 2001 | 137 |
| 2002 | 68 |
| 2003 | 54 |
| 2004 | 99 |
| 2005 | 96 |
| 2006 | 87 |
| 2007 | 35 |
| 2008 | 78 |
| 2009 | 47 |
| 2010 | 50 |
| 2011 | 43 |
| 2012 | 60 |
| 2013 | 47 |
| 2014 | 14 |
| 2015 | 29 |
| 2016 | 40 |
| 2017 | 48 |
| 2018 | 34 |
| 2019 | 18 |
| 2020 | 18 |
| 2021 | 9 |
| 2022 | 27 |
| 2023 | 16 |
| 2024 | 20 |