| Year | Count |
|---|---|
| 1983 | 17 |
| 1984 | 23 |
| 1985 | 52 |
| 1986 | 116 |
| 1987 | 84 |
| 1988 | 256 |
| 1989 | 684 |
| 1990 | 675 |
| 1991 | 997 |
| 1992 | 807 |
| 1993 | 915 |
| 1994 | 1,074 |
| 1995 | 1,057 |
| 1996 | 980 |
| 1997 | 1,109 |
| 1998 | 1,083 |
| 1999 | 939 |
| 2000 | 877 |
| 2001 | 701 |
| 2002 | 558 |
| 2003 | 598 |
| 2004 | 731 |
| 2005 | 734 |
| 2006 | 628 |
| 2007 | 554 |
| 2008 | 437 |
| 2009 | 378 |
| 2010 | 235 |
| 2011 | 225 |
| 2012 | 225 |
| 2013 | 126 |
| 2014 | 39 |
| 2015 | 91 |
| 2016 | 83 |
| 2017 | 64 |
| 2018 | 35 |
| 2019 | 21 |
| 2021 | 6 |
| 2022 | 8 |
| 2023 | 5 |
| 2024 | 5 |