| Year | Count |
|---|---|
| 1982 | 5 |
| 1984 | 7 |
| 1985 | 25 |
| 1986 | 56 |
| 1987 | 28 |
| 1988 | 13 |
| 1989 | 31 |
| 1990 | 89 |
| 1991 | 40 |
| 1992 | 86 |
| 1993 | 63 |
| 1994 | 33 |
| 1995 | 58 |
| 1996 | 74 |
| 1997 | 101 |
| 1998 | 140 |
| 1999 | 118 |
| 2000 | 95 |
| 2001 | 77 |
| 2002 | 99 |
| 2003 | 109 |
| 2004 | 108 |
| 2005 | 96 |
| 2006 | 102 |
| 2007 | 272 |
| 2008 | 193 |
| 2009 | 106 |
| 2010 | 117 |
| 2011 | 106 |
| 2012 | 88 |
| 2013 | 48 |
| 2014 | 68 |
| 2015 | 44 |
| 2016 | 47 |
| 2017 | 74 |
| 2018 | 29 |
| 2019 | 21 |
| 2020 | 17 |
| 2021 | 10 |
| 2022 | 34 |
| 2023 | 7 |