| Year | Count |
|---|---|
| 1987 | 7 |
| 1989 | 10 |
| 1990 | 52 |
| 1991 | 72 |
| 1992 | 25 |
| 1993 | 52 |
| 1994 | 19 |
| 1995 | 28 |
| 1996 | 38 |
| 1997 | 45 |
| 1998 | 54 |
| 1999 | 25 |
| 2000 | 56 |
| 2001 | 83 |
| 2002 | 86 |
| 2003 | 50 |
| 2004 | 52 |
| 2005 | 45 |
| 2006 | 39 |
| 2007 | 27 |
| 2009 | 5 |
| 2010 | 5 |
| 2011 | 18 |
| 2012 | 7 |
| 2014 | 6 |
| 2015 | 12 |
| 2016 | 6 |
| 2018 | 14 |
| 2019 | 10 |
| 2022 | 7 |
| 2023 | 5 |
| 2024 | 5 |