| Year | Count |
|---|---|
| 1980 | 16 |
| 1981 | 46 |
| 1982 | 16 |
| 1983 | 12 |
| 1984 | 26 |
| 1985 | 36 |
| 1986 | 56 |
| 1987 | 54 |
| 1988 | 80 |
| 1989 | 75 |
| 1990 | 131 |
| 1991 | 171 |
| 1992 | 201 |
| 1993 | 273 |
| 1994 | 345 |
| 1995 | 345 |
| 1996 | 406 |
| 1997 | 358 |
| 1998 | 518 |
| 1999 | 592 |
| 2000 | 756 |
| 2001 | 872 |
| 2002 | 903 |
| 2003 | 1,063 |
| 2004 | 1,476 |
| 2005 | 1,656 |
| 2006 | 1,686 |
| 2007 | 1,720 |
| 2008 | 1,517 |
| 2009 | 1,389 |
| 2010 | 1,526 |
| 2011 | 1,757 |
| 2012 | 1,929 |
| 2013 | 1,744 |
| 2014 | 1,636 |
| 2015 | 1,779 |
| 2016 | 1,835 |
| 2017 | 1,693 |
| 2018 | 1,541 |
| 2019 | 1,590 |
| 2020 | 1,309 |
| 2021 | 1,387 |
| 2022 | 1,376 |
| 2023 | 1,209 |
| 2024 | 1,156 |