| Year | Count |
|---|---|
| 1986 | 6 |
| 1991 | 7 |
| 1993 | 6 |
| 1994 | 5 |
| 1996 | 5 |
| 1997 | 18 |
| 1998 | 22 |
| 1999 | 15 |
| 2000 | 13 |
| 2001 | 51 |
| 2002 | 48 |
| 2003 | 142 |
| 2004 | 145 |
| 2005 | 184 |
| 2006 | 274 |
| 2007 | 203 |
| 2008 | 203 |
| 2009 | 222 |
| 2010 | 164 |
| 2011 | 131 |
| 2012 | 120 |
| 2013 | 197 |
| 2014 | 129 |
| 2015 | 115 |
| 2016 | 113 |
| 2017 | 122 |
| 2018 | 156 |
| 2019 | 106 |
| 2020 | 39 |
| 2021 | 58 |
| 2022 | 82 |
| 2023 | 80 |
| 2024 | 53 |