| Year | Count |
|---|---|
| 1919 | 5 |
| 1921 | 5 |
| 1925 | 5 |
| 1942 | 5 |
| 1951 | 5 |
| 1958 | 5 |
| 1965 | 5 |
| 1966 | 5 |
| 1969 | 6 |
| 1973 | 6 |
| 1976 | 6 |
| 1978 | 5 |
| 1980 | 6 |
| 1981 | 5 |
| 1983 | 5 |
| 1987 | 7 |
| 1989 | 5 |
| 1993 | 6 |
| 1994 | 7 |
| 1995 | 7 |
| 1999 | 7 |
| 2000 | 7 |
| 2001 | 7 |
| 2003 | 10 |
| 2004 | 8 |
| 2005 | 9 |
| 2006 | 5 |
| 2007 | 11 |
| 2008 | 8 |
| 2009 | 5 |
| 2010 | 14 |
| 2011 | 13 |
| 2012 | 13 |
| 2013 | 15 |
| 2014 | 12 |
| 2015 | 9 |
| 2016 | 42 |
| 2017 | 26 |
| 2018 | 28 |
| 2019 | 36 |
| 2020 | 8 |
| 2021 | 15 |
| 2022 | 11 |
| 2023 | 20 |
| 2024 | 16 |