| Year | Count |
|---|---|
| 1987 | 5 |
| 1989 | 5 |
| 1990 | 5 |
| 1991 | 5 |
| 1992 | 8 |
| 1993 | 6 |
| 1994 | 13 |
| 1995 | 38 |
| 1996 | 31 |
| 1997 | 64 |
| 1998 | 59 |
| 1999 | 45 |
| 2000 | 82 |
| 2001 | 143 |
| 2002 | 149 |
| 2003 | 141 |
| 2004 | 171 |
| 2005 | 198 |
| 2006 | 146 |
| 2007 | 194 |
| 2008 | 157 |
| 2009 | 183 |
| 2010 | 199 |
| 2011 | 189 |
| 2012 | 198 |
| 2013 | 170 |
| 2014 | 204 |
| 2015 | 278 |
| 2016 | 319 |
| 2017 | 386 |
| 2018 | 307 |
| 2019 | 358 |
| 2020 | 292 |
| 2021 | 379 |
| 2022 | 413 |
| 2023 | 427 |
| 2024 | 464 |