| Year | Count |
|---|---|
| 1985 | 5 |
| 1991 | 32 |
| 1992 | 43 |
| 1993 | 12 |
| 1994 | 7 |
| 1995 | 15 |
| 1996 | 19 |
| 1997 | 12 |
| 1998 | 28 |
| 1999 | 28 |
| 2000 | 51 |
| 2001 | 82 |
| 2002 | 70 |
| 2003 | 105 |
| 2004 | 139 |
| 2005 | 135 |
| 2006 | 232 |
| 2007 | 294 |
| 2008 | 332 |
| 2009 | 352 |
| 2010 | 752 |
| 2011 | 946 |
| 2012 | 1,110 |
| 2013 | 985 |
| 2014 | 822 |
| 2015 | 719 |
| 2016 | 740 |
| 2017 | 680 |
| 2018 | 506 |
| 2019 | 371 |
| 2020 | 410 |
| 2021 | 366 |
| 2022 | 379 |
| 2023 | 321 |
| 2024 | 347 |