| Year | Count |
|---|---|
| 1984 | 12 |
| 1987 | 5 |
| 1988 | 19 |
| 1990 | 10 |
| 1992 | 24 |
| 1993 | 20 |
| 1994 | 8 |
| 1995 | 17 |
| 1996 | 6 |
| 1997 | 31 |
| 1998 | 15 |
| 1999 | 32 |
| 2000 | 43 |
| 2001 | 43 |
| 2002 | 15 |
| 2003 | 63 |
| 2004 | 159 |
| 2005 | 218 |
| 2006 | 320 |
| 2007 | 282 |
| 2008 | 429 |
| 2009 | 410 |
| 2010 | 583 |
| 2011 | 833 |
| 2012 | 986 |
| 2013 | 1,118 |
| 2014 | 1,205 |
| 2015 | 1,334 |
| 2016 | 1,334 |
| 2017 | 1,412 |
| 2018 | 1,287 |
| 2019 | 1,335 |
| 2020 | 1,309 |
| 2021 | 1,364 |
| 2022 | 1,130 |
| 2023 | 1,060 |
| 2024 | 923 |