| Year | Count |
|---|---|
| 1983 | 7 |
| 1988 | 16 |
| 1989 | 33 |
| 1990 | 30 |
| 1991 | 28 |
| 1992 | 31 |
| 1993 | 85 |
| 1994 | 45 |
| 1995 | 73 |
| 1996 | 71 |
| 1997 | 78 |
| 1998 | 101 |
| 1999 | 128 |
| 2000 | 113 |
| 2001 | 157 |
| 2002 | 222 |
| 2003 | 246 |
| 2004 | 317 |
| 2005 | 409 |
| 2006 | 408 |
| 2007 | 514 |
| 2008 | 556 |
| 2009 | 497 |
| 2010 | 471 |
| 2011 | 476 |
| 2012 | 431 |
| 2013 | 393 |
| 2014 | 352 |
| 2015 | 330 |
| 2016 | 332 |
| 2017 | 340 |
| 2018 | 187 |
| 2019 | 171 |
| 2020 | 274 |
| 2021 | 383 |
| 2022 | 296 |
| 2023 | 386 |
| 2024 | 257 |