| Year | Count |
|---|---|
| 1983 | 5 |
| 1984 | 10 |
| 1985 | 24 |
| 1986 | 91 |
| 1987 | 147 |
| 1988 | 115 |
| 1989 | 231 |
| 1990 | 256 |
| 1991 | 347 |
| 1992 | 364 |
| 1993 | 314 |
| 1994 | 399 |
| 1995 | 456 |
| 1996 | 529 |
| 1997 | 599 |
| 1998 | 839 |
| 1999 | 745 |
| 2000 | 784 |
| 2001 | 767 |
| 2002 | 774 |
| 2003 | 918 |
| 2004 | 1,297 |
| 2005 | 1,362 |
| 2006 | 1,358 |
| 2007 | 1,319 |
| 2008 | 1,180 |
| 2009 | 908 |
| 2010 | 727 |
| 2011 | 848 |
| 2012 | 802 |
| 2013 | 619 |
| 2014 | 465 |
| 2015 | 529 |
| 2016 | 517 |
| 2017 | 412 |
| 2018 | 272 |
| 2019 | 253 |
| 2020 | 253 |
| 2021 | 264 |
| 2022 | 163 |
| 2023 | 145 |
| 2024 | 162 |