| Year | Count |
|---|---|
| 1970 | 8 |
| 1973 | 5 |
| 1977 | 5 |
| 1979 | 10 |
| 1987 | 5 |
| 1989 | 6 |
| 1989 | 6 |
| 1994 | 5 |
| 1998 | 8 |
| 1999 | 7 |
| 1999 | 5 |
| 2000 | 6 |
| 2001 | 5 |
| 2002 | 6 |
| 2003 | 7 |
| 2004 | 5 |
| 2005 | 7 |
| 2006 | 6 |
| 2007 | 7 |
| 2007 | 6 |
| 2008 | 14 |
| 2008 | 8 |
| 2009 | 6 |
| 2009 | 7 |
| 2010 | 6 |
| 2011 | 8 |
| 2011 | 9 |
| 2012 | 7 |
| 2012 | 9 |
| 2013 | 7 |
| 2013 | 7 |
| 2014 | 6 |
| 2015 | 27 |
| 2015 | 9 |
| 2016 | 48 |
| 2016 | 18 |
| 2017 | 36 |
| 2017 | 12 |
| 2018 | 14 |
| 2018 | 12 |
| 2019 | 30 |
| 2019 | 7 |
| 2020 | 34 |
| 2020 | 12 |
| 2021 | 60 |
| 2021 | 10 |
| 2022 | 54 |
| 2022 | 8 |
| 2023 | 34 |
| 2023 | 7 |
| 2024 | 34 |
| 2024 | 9 |