| Year | Count |
|---|---|
| 1986 | 21 |
| 1987 | 40 |
| 1988 | 84 |
| 1989 | 206 |
| 1990 | 322 |
| 1991 | 422 |
| 1992 | 599 |
| 1993 | 722 |
| 1994 | 710 |
| 1995 | 744 |
| 1996 | 834 |
| 1997 | 888 |
| 1998 | 989 |
| 1999 | 835 |
| 2000 | 815 |
| 2001 | 862 |
| 2002 | 764 |
| 2003 | 743 |
| 2004 | 866 |
| 2004 | 10 |
| 2005 | 840 |
| 2006 | 693 |
| 2007 | 796 |
| 2008 | 636 |
| 2009 | 475 |
| 2010 | 349 |
| 2011 | 385 |
| 2012 | 462 |
| 2013 | 296 |
| 2014 | 271 |
| 2015 | 281 |
| 2016 | 141 |
| 2017 | 71 |
| 2018 | 49 |
| 2019 | 28 |
| 2020 | 46 |
| 2021 | 7 |
| 2022 | 22 |
| 2023 | 7 |
| 2024 | 23 |