| Year | Count |
|---|---|
| 1989 | 6 |
| 1990 | 5 |
| 1993 | 11 |
| 1996 | 22 |
| 1997 | 35 |
| 1998 | 45 |
| 1999 | 44 |
| 2000 | 64 |
| 2001 | 68 |
| 2002 | 71 |
| 2003 | 83 |
| 2004 | 119 |
| 2005 | 177 |
| 2006 | 184 |
| 2007 | 163 |
| 2008 | 178 |
| 2009 | 153 |
| 2010 | 177 |
| 2011 | 166 |
| 2012 | 122 |
| 2013 | 160 |
| 2014 | 197 |
| 2015 | 165 |
| 2016 | 184 |
| 2017 | 139 |
| 2018 | 74 |
| 2019 | 88 |
| 2020 | 51 |
| 2021 | 57 |
| 2022 | 19 |
| 2023 | 11 |
| 2024 | 67 |