| Year | Count |
|---|---|
| 1986 | 18 |
| 1987 | 30 |
| 1988 | 119 |
| 1989 | 80 |
| 1990 | 131 |
| 1991 | 185 |
| 1992 | 165 |
| 1993 | 280 |
| 1994 | 302 |
| 1995 | 295 |
| 1996 | 330 |
| 1997 | 489 |
| 1998 | 623 |
| 1999 | 576 |
| 2000 | 599 |
| 2001 | 584 |
| 2002 | 624 |
| 2003 | 683 |
| 2004 | 950 |
| 2005 | 990 |
| 2006 | 936 |
| 2007 | 851 |
| 2008 | 1,040 |
| 2009 | 1,156 |
| 2010 | 1,175 |
| 2011 | 1,299 |
| 2012 | 1,479 |
| 2013 | 1,375 |
| 2014 | 1,457 |
| 2015 | 1,755 |
| 2016 | 1,846 |
| 2017 | 2,069 |
| 2018 | 14 |
| 2018 | 2,333 |
| 2019 | 1,963 |
| 2020 | 1,878 |
| 2021 | 2,001 |
| 2022 | 1,424 |
| 2023 | 1,362 |
| 2024 | 5 |
| 2024 | 1,375 |