| Year | Count |
|---|---|
| 1984 | 7 |
| 1985 | 12 |
| 1986 | 7 |
| 1987 | 24 |
| 1988 | 28 |
| 1989 | 34 |
| 1990 | 51 |
| 1991 | 72 |
| 1992 | 103 |
| 1993 | 115 |
| 1994 | 146 |
| 1995 | 160 |
| 1996 | 215 |
| 1997 | 222 |
| 1998 | 359 |
| 1999 | 564 |
| 2000 | 531 |
| 2001 | 504 |
| 2002 | 656 |
| 2003 | 521 |
| 2004 | 784 |
| 2005 | 820 |
| 2006 | 708 |
| 2007 | 730 |
| 2008 | 796 |
| 2009 | 734 |
| 2010 | 623 |
| 2011 | 464 |
| 2012 | 422 |
| 2013 | 442 |
| 2014 | 408 |
| 2015 | 401 |
| 2016 | 398 |
| 2017 | 299 |
| 2018 | 260 |
| 2019 | 238 |
| 2020 | 244 |
| 2021 | 346 |
| 2022 | 195 |
| 2023 | 193 |
| 2024 | 117 |