| Year | Count |
|---|---|
| 1974 | 7 |
| 1975 | 5 |
| 1979 | 7 |
| 1982 | 5 |
| 1983 | 5 |
| 1986 | 5 |
| 1993 | 5 |
| 1998 | 16 |
| 1999 | 5 |
| 2000 | 14 |
| 2003 | 19 |
| 2004 | 10 |
| 2005 | 14 |
| 2006 | 28 |
| 2007 | 22 |
| 2008 | 29 |
| 2009 | 13 |
| 2010 | 5 |
| 2011 | 27 |
| 2012 | 27 |
| 2013 | 36 |
| 2014 | 36 |
| 2015 | 50 |
| 2016 | 10 |
| 2017 | 19 |
| 2018 | 46 |
| 2019 | 6 |
| 2020 | 30 |
| 2021 | 42 |
| 2022 | 29 |
| 2023 | 16 |
| 2024 | 13 |