| Year | Count |
|---|---|
| 1987 | 5 |
| 1988 | 53 |
| 1989 | 72 |
| 1990 | 42 |
| 1991 | 23 |
| 1992 | 66 |
| 1993 | 92 |
| 1994 | 65 |
| 1995 | 71 |
| 1996 | 47 |
| 1997 | 82 |
| 1998 | 65 |
| 1999 | 30 |
| 2000 | 31 |
| 2001 | 47 |
| 2002 | 10 |
| 2003 | 27 |
| 2004 | 29 |
| 2005 | 82 |
| 2006 | 60 |
| 2007 | 13 |
| 2008 | 67 |
| 2009 | 83 |
| 2010 | 100 |
| 2011 | 102 |
| 2012 | 121 |
| 2013 | 149 |
| 2014 | 197 |
| 2015 | 274 |
| 2016 | 306 |
| 2017 | 388 |
| 2018 | 416 |
| 2019 | 559 |
| 2020 | 493 |
| 2021 | 682 |
| 2022 | 672 |
| 2023 | 683 |
| 2024 | 656 |