| Year | Count |
|---|---|
| 1991 | 6 |
| 1992 | 19 |
| 1994 | 11 |
| 1995 | 10 |
| 1996 | 46 |
| 1997 | 58 |
| 1998 | 105 |
| 1999 | 119 |
| 2000 | 162 |
| 2001 | 241 |
| 2002 | 215 |
| 2003 | 225 |
| 2004 | 341 |
| 2005 | 380 |
| 2006 | 508 |
| 2007 | 466 |
| 2008 | 687 |
| 2009 | 713 |
| 2010 | 1,013 |
| 2011 | 1,152 |
| 2012 | 1,143 |
| 2013 | 989 |
| 2014 | 903 |
| 2015 | 886 |
| 2016 | 892 |
| 2017 | 784 |
| 2018 | 779 |
| 2019 | 687 |
| 2020 | 482 |
| 2021 | 511 |
| 2022 | 389 |
| 2023 | 320 |
| 2024 | 359 |