| Year | Count |
|---|---|
| 1981 | 5 |
| 1982 | 12 |
| 1984 | 5 |
| 1985 | 25 |
| 1986 | 14 |
| 1988 | 22 |
| 1989 | 14 |
| 1990 | 86 |
| 1991 | 158 |
| 1992 | 295 |
| 1993 | 258 |
| 1994 | 617 |
| 1995 | 1,046 |
| 1995 | 5 |
| 1996 | 1,320 |
| 1997 | 1,409 |
| 1998 | 1,686 |
| 1999 | 1,632 |
| 2000 | 1,753 |
| 2001 | 1,838 |
| 2002 | 2,017 |
| 2003 | 1,930 |
| 2004 | 2,232 |
| 2004 | 10 |
| 2005 | 2,215 |
| 2006 | 2,028 |
| 2007 | 2,006 |
| 2008 | 1,847 |
| 2009 | 1,744 |
| 2010 | 1,583 |
| 2011 | 1,609 |
| 2012 | 1,699 |
| 2013 | 1,738 |
| 2014 | 1,559 |
| 2015 | 1,576 |
| 2016 | 1,574 |
| 2017 | 1,561 |
| 2018 | 1,595 |
| 2019 | 1,319 |
| 2020 | 1,326 |
| 2021 | 1,255 |
| 2022 | 1,365 |
| 2023 | 1,153 |
| 2024 | 936 |