| Year | Count |
|---|---|
| 1984 | 10 |
| 1989 | 5 |
| 1990 | 8 |
| 1991 | 14 |
| 1992 | 84 |
| 1993 | 77 |
| 1994 | 101 |
| 1995 | 122 |
| 1996 | 109 |
| 1997 | 181 |
| 1998 | 184 |
| 1999 | 230 |
| 2000 | 229 |
| 2001 | 295 |
| 2002 | 314 |
| 2003 | 355 |
| 2004 | 334 |
| 2005 | 414 |
| 2006 | 362 |
| 2007 | 380 |
| 2008 | 415 |
| 2009 | 456 |
| 2010 | 450 |
| 2011 | 350 |
| 2012 | 351 |
| 2013 | 318 |
| 2014 | 329 |
| 2015 | 327 |
| 2016 | 353 |
| 2017 | 346 |
| 2018 | 300 |
| 2019 | 257 |
| 2020 | 242 |
| 2021 | 255 |
| 2022 | 195 |
| 2023 | 205 |
| 2024 | 118 |