| Year | Count |
|---|---|
| 1983 | 9 |
| 1984 | 25 |
| 1985 | 14 |
| 1988 | 15 |
| 1990 | 12 |
| 1991 | 12 |
| 1992 | 6 |
| 1993 | 10 |
| 1994 | 7 |
| 1995 | 15 |
| 1996 | 40 |
| 1997 | 41 |
| 1998 | 49 |
| 1999 | 18 |
| 2000 | 35 |
| 2001 | 55 |
| 2002 | 26 |
| 2003 | 62 |
| 2004 | 96 |
| 2005 | 102 |
| 2006 | 94 |
| 2007 | 71 |
| 2008 | 89 |
| 2009 | 15 |
| 2010 | 41 |
| 2011 | 28 |
| 2012 | 10 |
| 2013 | 5 |
| 2014 | 5 |
| 2015 | 9 |
| 2016 | 8 |
| 2019 | 7 |
| 2020 | 9 |
| 2021 | 9 |
| 2022 | 16 |
| 2023 | 5 |
| 2024 | 6 |