| Year | Count |
|---|---|
| 1982 | 5 |
| 1990 | 6 |
| 1991 | 5 |
| 1993 | 5 |
| 1997 | 5 |
| 1998 | 9 |
| 1999 | 9 |
| 2000 | 8 |
| 2001 | 5 |
| 2002 | 14 |
| 2003 | 11 |
| 2004 | 8 |
| 2005 | 15 |
| 2006 | 16 |
| 2007 | 16 |
| 2008 | 16 |
| 2009 | 24 |
| 2010 | 21 |
| 2011 | 24 |
| 2012 | 23 |
| 2013 | 18 |
| 2014 | 27 |
| 2015 | 40 |
| 2016 | 34 |
| 2017 | 48 |
| 2018 | 26 |
| 2019 | 49 |
| 2020 | 47 |
| 2021 | 41 |
| 2022 | 36 |
| 2023 | 40 |
| 2024 | 36 |