| Year | Count |
|---|---|
| 1990 | 5 |
| 1996 | 6 |
| 1997 | 6 |
| 1998 | 5 |
| 1999 | 7 |
| 2000 | 9 |
| 2001 | 5 |
| 2002 | 14 |
| 2003 | 26 |
| 2004 | 18 |
| 2005 | 26 |
| 2006 | 37 |
| 2007 | 35 |
| 2008 | 34 |
| 2009 | 45 |
| 2010 | 39 |
| 2011 | 52 |
| 2012 | 51 |
| 2013 | 47 |
| 2014 | 58 |
| 2015 | 58 |
| 2016 | 159 |
| 2017 | 189 |
| 2018 | 122 |
| 2019 | 126 |
| 2020 | 112 |
| 2021 | 122 |
| 2022 | 120 |
| 2023 | 92 |
| 2024 | 96 |