| Year | Count |
|---|---|
| 1983 | 9 |
| 1984 | 10 |
| 1985 | 27 |
| 1986 | 21 |
| 1987 | 14 |
| 1988 | 16 |
| 1989 | 22 |
| 1990 | 17 |
| 1991 | 17 |
| 1992 | 51 |
| 1993 | 173 |
| 1994 | 515 |
| 1995 | 629 |
| 1996 | 693 |
| 1997 | 918 |
| 1998 | 972 |
| 1999 | 1,028 |
| 2000 | 1,030 |
| 2001 | 1,012 |
| 2002 | 939 |
| 2003 | 838 |
| 2004 | 989 |
| 2005 | 979 |
| 2006 | 802 |
| 2007 | 823 |
| 2008 | 784 |
| 2009 | 783 |
| 2010 | 698 |
| 2011 | 667 |
| 2012 | 788 |
| 2013 | 792 |
| 2014 | 751 |
| 2015 | 743 |
| 2016 | 693 |
| 2017 | 685 |
| 2018 | 535 |
| 2019 | 453 |
| 2020 | 456 |
| 2021 | 427 |
| 2022 | 346 |
| 2023 | 291 |
| 2024 | 263 |