| Year | Count |
|---|---|
| 1978 | 10 |
| 1982 | 28 |
| 1983 | 44 |
| 1984 | 33 |
| 1985 | 52 |
| 1986 | 139 |
| 1987 | 308 |
| 1988 | 349 |
| 1989 | 480 |
| 1990 | 547 |
| 1991 | 839 |
| 1992 | 625 |
| 1993 | 648 |
| 1994 | 621 |
| 1995 | 625 |
| 1996 | 635 |
| 1997 | 649 |
| 1998 | 601 |
| 1999 | 509 |
| 2000 | 578 |
| 2001 | 512 |
| 2002 | 414 |
| 2003 | 462 |
| 2004 | 486 |
| 2005 | 437 |
| 2006 | 370 |
| 2007 | 407 |
| 2008 | 347 |
| 2009 | 200 |
| 2010 | 238 |
| 2011 | 147 |
| 2012 | 145 |
| 2013 | 93 |
| 2014 | 154 |
| 2015 | 123 |
| 2016 | 134 |
| 2017 | 142 |
| 2018 | 75 |
| 2019 | 111 |
| 2020 | 62 |
| 2021 | 77 |
| 2022 | 85 |
| 2023 | 78 |
| 2024 | 77 |