| Year | Count |
|---|---|
| 1982 | 9 |
| 1983 | 8 |
| 1984 | 20 |
| 1985 | 22 |
| 1986 | 33 |
| 1987 | 62 |
| 1988 | 84 |
| 1989 | 136 |
| 1990 | 155 |
| 1991 | 249 |
| 1992 | 403 |
| 1993 | 486 |
| 1994 | 712 |
| 1995 | 682 |
| 1996 | 673 |
| 1997 | 711 |
| 1998 | 763 |
| 1999 | 757 |
| 2000 | 744 |
| 2001 | 643 |
| 2002 | 627 |
| 2003 | 501 |
| 2004 | 755 |
| 2005 | 522 |
| 2006 | 492 |
| 2007 | 300 |
| 2008 | 368 |
| 2009 | 273 |
| 2010 | 243 |
| 2011 | 205 |
| 2012 | 172 |
| 2013 | 164 |
| 2014 | 163 |
| 2015 | 91 |
| 2016 | 116 |
| 2017 | 123 |
| 2018 | 73 |
| 2019 | 47 |
| 2020 | 89 |
| 2021 | 54 |
| 2022 | 75 |
| 2023 | 45 |
| 2024 | 48 |