| Year | Count |
|---|---|
| 1980 | 15 |
| 1983 | 5 |
| 1984 | 6 |
| 1987 | 12 |
| 1988 | 15 |
| 1989 | 5 |
| 1990 | 10 |
| 1991 | 56 |
| 1992 | 23 |
| 1993 | 41 |
| 1994 | 32 |
| 1995 | 142 |
| 1996 | 132 |
| 1997 | 141 |
| 1998 | 103 |
| 1999 | 77 |
| 2000 | 54 |
| 2001 | 98 |
| 2002 | 47 |
| 2003 | 71 |
| 2004 | 49 |
| 2005 | 14 |
| 2006 | 54 |
| 2007 | 42 |
| 2008 | 62 |
| 2009 | 48 |
| 2010 | 84 |
| 2011 | 48 |
| 2012 | 47 |
| 2013 | 19 |
| 2014 | 33 |
| 2015 | 81 |
| 2016 | 62 |
| 2017 | 62 |
| 2018 | 42 |
| 2019 | 36 |
| 2020 | 33 |
| 2021 | 47 |
| 2022 | 47 |
| 2023 | 68 |
| 2024 | 91 |