| Year | Count |
|---|---|
| 1988 | 17 |
| 1989 | 65 |
| 1990 | 112 |
| 1991 | 118 |
| 1992 | 114 |
| 1993 | 70 |
| 1994 | 66 |
| 1995 | 108 |
| 1996 | 63 |
| 1997 | 92 |
| 1998 | 94 |
| 1999 | 56 |
| 2000 | 99 |
| 2001 | 114 |
| 2002 | 93 |
| 2003 | 105 |
| 2004 | 76 |
| 2005 | 89 |
| 2006 | 133 |
| 2007 | 141 |
| 2008 | 226 |
| 2009 | 222 |
| 2010 | 218 |
| 2011 | 214 |
| 2012 | 316 |
| 2013 | 394 |
| 2014 | 378 |
| 2015 | 416 |
| 2016 | 447 |
| 2017 | 529 |
| 2018 | 546 |
| 2019 | 772 |
| 2020 | 791 |
| 2021 | 1,215 |
| 2022 | 1,183 |
| 2023 | 1,039 |
| 2024 | 1,032 |