| Year | Count |
|---|---|
| 1990 | 5 |
| 1993 | 5 |
| 1994 | 12 |
| 1995 | 7 |
| 1996 | 8 |
| 1997 | 16 |
| 1998 | 27 |
| 1999 | 15 |
| 2000 | 33 |
| 2001 | 35 |
| 2002 | 32 |
| 2003 | 67 |
| 2004 | 53 |
| 2005 | 104 |
| 2006 | 90 |
| 2007 | 187 |
| 2008 | 145 |
| 2009 | 296 |
| 2010 | 291 |
| 2011 | 318 |
| 2012 | 455 |
| 2013 | 498 |
| 2014 | 658 |
| 2015 | 1,119 |
| 2016 | 1,242 |
| 2017 | 1,320 |
| 2018 | 1,535 |
| 2019 | 1,632 |
| 2020 | 1,360 |
| 2021 | 1,517 |
| 2022 | 1,184 |
| 2023 | 1,009 |
| 2024 | 882 |