| Year | Count |
|---|---|
| 1985 | 5 |
| 1986 | 16 |
| 1988 | 10 |
| 1989 | 7 |
| 1990 | 19 |
| 1991 | 17 |
| 1992 | 19 |
| 1993 | 5 |
| 1994 | 26 |
| 1995 | 34 |
| 1996 | 44 |
| 1997 | 49 |
| 1998 | 54 |
| 1999 | 113 |
| 2000 | 92 |
| 2001 | 140 |
| 2002 | 107 |
| 2003 | 147 |
| 2004 | 151 |
| 2005 | 193 |
| 2006 | 209 |
| 2007 | 206 |
| 2008 | 293 |
| 2009 | 259 |
| 2010 | 248 |
| 2011 | 230 |
| 2012 | 380 |
| 2013 | 379 |
| 2014 | 374 |
| 2015 | 366 |
| 2016 | 6 |
| 2016 | 403 |
| 2017 | 437 |
| 2018 | 536 |
| 2019 | 597 |
| 2020 | 454 |
| 2021 | 521 |
| 2022 | 494 |
| 2023 | 462 |
| 2024 | 509 |