| Year | Count |
|---|---|
| 1985 | 25 |
| 1988 | 9 |
| 1989 | 29 |
| 1990 | 10 |
| 1991 | 9 |
| 1992 | 23 |
| 1993 | 10 |
| 1994 | 14 |
| 1995 | 24 |
| 1996 | 35 |
| 1997 | 31 |
| 1998 | 50 |
| 1999 | 74 |
| 2000 | 61 |
| 2001 | 169 |
| 2002 | 109 |
| 2003 | 120 |
| 2004 | 153 |
| 2005 | 218 |
| 2006 | 301 |
| 2007 | 291 |
| 2008 | 499 |
| 2009 | 560 |
| 2010 | 586 |
| 2011 | 567 |
| 2012 | 787 |
| 2013 | 924 |
| 2014 | 911 |
| 2015 | 947 |
| 2016 | 1,009 |
| 2017 | 786 |
| 2018 | 688 |
| 2019 | 592 |
| 2020 | 411 |
| 2021 | 571 |
| 2022 | 370 |
| 2023 | 346 |
| 2024 | 305 |