| Year | Count |
|---|---|
| 1974 | 16 |
| 1977 | 5 |
| 1979 | 5 |
| 1982 | 5 |
| 1984 | 5 |
| 1985 | 16 |
| 1986 | 29 |
| 1987 | 43 |
| 1988 | 66 |
| 1989 | 23 |
| 1990 | 52 |
| 1991 | 54 |
| 1992 | 50 |
| 1993 | 155 |
| 1994 | 243 |
| 1995 | 257 |
| 1996 | 206 |
| 1997 | 234 |
| 1998 | 332 |
| 1999 | 313 |
| 2000 | 346 |
| 2001 | 316 |
| 2002 | 278 |
| 2003 | 252 |
| 2004 | 295 |
| 2005 | 275 |
| 2006 | 309 |
| 2007 | 365 |
| 2008 | 685 |
| 2009 | 566 |
| 2010 | 474 |
| 2011 | 502 |
| 2012 | 548 |
| 2013 | 533 |
| 2014 | 667 |
| 2015 | 867 |
| 2016 | 1,037 |
| 2017 | 1,186 |
| 2018 | 1,355 |
| 2019 | 1,220 |
| 2020 | 1,056 |
| 2021 | 1,148 |
| 2022 | 1,044 |
| 2023 | 864 |
| 2024 | 778 |