| Year | Count |
|---|---|
| 1983 | 5 |
| 1987 | 10 |
| 1988 | 20 |
| 1989 | 13 |
| 1990 | 76 |
| 1991 | 131 |
| 1992 | 120 |
| 1993 | 122 |
| 1994 | 141 |
| 1995 | 164 |
| 1996 | 192 |
| 1997 | 180 |
| 1998 | 182 |
| 1999 | 195 |
| 2000 | 848 |
| 2001 | 432 |
| 2002 | 263 |
| 2003 | 187 |
| 2004 | 179 |
| 2005 | 180 |
| 2006 | 141 |
| 2007 | 125 |
| 2008 | 135 |
| 2009 | 119 |
| 2010 | 77 |
| 2011 | 79 |
| 2012 | 53 |
| 2013 | 40 |
| 2014 | 48 |
| 2015 | 62 |
| 2016 | 43 |
| 2017 | 32 |
| 2018 | 34 |
| 2019 | 22 |
| 2020 | 16 |
| 2021 | 25 |
| 2022 | 6 |
| 2023 | 40 |