| Year | Count |
|---|---|
| 1983 | 8 |
| 1984 | 6 |
| 1985 | 20 |
| 1986 | 5 |
| 1987 | 10 |
| 1988 | 28 |
| 1989 | 10 |
| 1990 | 46 |
| 1991 | 17 |
| 1992 | 42 |
| 1993 | 6 |
| 1994 | 5 |
| 1995 | 39 |
| 1996 | 36 |
| 1997 | 7 |
| 1998 | 46 |
| 1999 | 51 |
| 2000 | 41 |
| 2001 | 52 |
| 2002 | 32 |
| 2003 | 37 |
| 2004 | 61 |
| 2005 | 60 |
| 2006 | 49 |
| 2007 | 22 |
| 2008 | 62 |
| 2009 | 22 |
| 2010 | 56 |
| 2011 | 29 |
| 2012 | 20 |
| 2013 | 28 |
| 2014 | 24 |
| 2015 | 60 |
| 2016 | 44 |
| 2017 | 17 |
| 2018 | 10 |
| 2019 | 20 |
| 2020 | 5 |
| 2021 | 11 |
| 2022 | 10 |
| 2023 | 5 |
| 2024 | 7 |