| Year | Count |
|---|---|
| 1984 | 5 |
| 1985 | 5 |
| 1986 | 7 |
| 1987 | 6 |
| 1988 | 21 |
| 1989 | 17 |
| 1990 | 35 |
| 1991 | 40 |
| 1992 | 74 |
| 1993 | 130 |
| 1994 | 78 |
| 1995 | 162 |
| 1996 | 93 |
| 1997 | 180 |
| 1998 | 190 |
| 1999 | 172 |
| 2000 | 149 |
| 2001 | 117 |
| 2002 | 110 |
| 2003 | 128 |
| 2004 | 138 |
| 2005 | 163 |
| 2006 | 299 |
| 2007 | 132 |
| 2008 | 247 |
| 2009 | 166 |
| 2010 | 178 |
| 2011 | 166 |
| 2012 | 105 |
| 2013 | 63 |
| 2014 | 42 |
| 2015 | 84 |
| 2016 | 63 |
| 2017 | 41 |
| 2018 | 44 |
| 2019 | 22 |
| 2020 | 5 |
| 2021 | 16 |
| 2022 | 15 |
| 2023 | 5 |
| 2024 | 5 |