| Year | Count |
|---|---|
| 1982 | 7 |
| 1983 | 5 |
| 1985 | 7 |
| 1986 | 12 |
| 1987 | 6 |
| 1988 | 11 |
| 1989 | 12 |
| 1990 | 7 |
| 1991 | 12 |
| 1992 | 10 |
| 1993 | 19 |
| 1994 | 12 |
| 1995 | 7 |
| 1996 | 8 |
| 1997 | 5 |
| 1998 | 18 |
| 1999 | 17 |
| 2000 | 27 |
| 2001 | 24 |
| 2002 | 10 |
| 2004 | 6 |
| 2005 | 49 |
| 2006 | 54 |
| 2007 | 87 |
| 2008 | 105 |
| 2009 | 55 |
| 2010 | 45 |
| 2011 | 40 |
| 2012 | 68 |
| 2013 | 70 |
| 2014 | 78 |
| 2015 | 102 |
| 2016 | 87 |
| 2017 | 49 |
| 2018 | 68 |
| 2019 | 20 |
| 2020 | 25 |
| 2021 | 42 |
| 2022 | 50 |
| 2023 | 43 |
| 2024 | 48 |