| Year | Count |
|---|---|
| 1983 | 8 |
| 1984 | 5 |
| 1986 | 28 |
| 1987 | 15 |
| 1988 | 43 |
| 1989 | 48 |
| 1990 | 77 |
| 1991 | 126 |
| 1992 | 103 |
| 1993 | 98 |
| 1994 | 70 |
| 1995 | 51 |
| 1996 | 256 |
| 1997 | 151 |
| 1998 | 128 |
| 1999 | 148 |
| 2000 | 95 |
| 2001 | 151 |
| 2002 | 201 |
| 2003 | 144 |
| 2004 | 213 |
| 2005 | 254 |
| 2006 | 163 |
| 2007 | 121 |
| 2008 | 126 |
| 2009 | 90 |
| 2010 | 69 |
| 2011 | 66 |
| 2012 | 85 |
| 2013 | 17 |
| 2014 | 50 |
| 2015 | 121 |
| 2016 | 55 |
| 2017 | 46 |
| 2018 | 68 |
| 2019 | 70 |
| 2020 | 53 |
| 2021 | 43 |
| 2022 | 73 |
| 2023 | 77 |
| 2024 | 55 |