| Year | Count |
|---|---|
| 1987 | 5 |
| 1988 | 5 |
| 1989 | 21 |
| 1991 | 5 |
| 1993 | 6 |
| 1994 | 5 |
| 1995 | 6 |
| 1998 | 11 |
| 1999 | 6 |
| 2000 | 12 |
| 2001 | 15 |
| 2002 | 11 |
| 2003 | 14 |
| 2004 | 13 |
| 2005 | 26 |
| 2006 | 60 |
| 2007 | 66 |
| 2008 | 62 |
| 2009 | 93 |
| 2010 | 74 |
| 2011 | 73 |
| 2012 | 75 |
| 2013 | 73 |
| 2014 | 93 |
| 2015 | 34 |
| 2016 | 46 |
| 2018 | 5 |
| 2019 | 24 |
| 2020 | 22 |
| 2021 | 6 |
| 2022 | 17 |
| 2023 | 28 |