| Year | Count |
|---|---|
| 1986 | 5 |
| 1988 | 5 |
| 1989 | 12 |
| 1990 | 28 |
| 1991 | 22 |
| 1992 | 57 |
| 1993 | 90 |
| 1994 | 178 |
| 1995 | 233 |
| 1996 | 368 |
| 1997 | 391 |
| 1998 | 561 |
| 1999 | 996 |
| 2000 | 1,354 |
| 2001 | 5 |
| 2001 | 1,782 |
| 2002 | 5 |
| 2002 | 2,442 |
| 2003 | 12 |
| 2003 | 4,052 |
| 2004 | 30 |
| 2004 | 5,040 |
| 2005 | 104 |
| 2005 | 5,411 |
| 2006 | 64 |
| 2006 | 5,921 |
| 2007 | 42 |
| 2007 | 5,323 |
| 2008 | 6 |
| 2008 | 5,409 |
| 2009 | 48 |
| 2009 | 4,958 |
| 2010 | 4,190 |
| 2011 | 3,913 |
| 2012 | 3,802 |
| 2013 | 3,273 |
| 2014 | 2,950 |
| 2015 | 3,205 |
| 2016 | 2,854 |
| 2017 | 2,447 |
| 2018 | 2,297 |
| 2019 | 1,989 |
| 2020 | 1,501 |
| 2021 | 1,514 |
| 2022 | 1,485 |
| 2023 | 1,341 |
| 2024 | 1,264 |