| Year | Count |
|---|---|
| 1914 | 6 |
| 1921 | 5 |
| 1924 | 5 |
| 1925 | 5 |
| 1933 | 6 |
| 1935 | 5 |
| 1947 | 6 |
| 1950 | 6 |
| 1953 | 8 |
| 1956 | 10 |
| 1959 | 6 |
| 1960 | 7 |
| 1962 | 5 |
| 1963 | 5 |
| 1965 | 5 |
| 1966 | 6 |
| 1967 | 6 |
| 1968 | 6 |
| 1969 | 6 |
| 1970 | 6 |
| 1975 | 5 |
| 1978 | 7 |
| 1983 | 6 |
| 1985 | 5 |
| 1989 | 8 |
| 1990 | 5 |
| 1992 | 5 |
| 1996 | 7 |
| 1997 | 11 |
| 2001 | 5 |
| 2002 | 10 |
| 2003 | 15 |
| 2004 | 9 |
| 2005 | 7 |
| 2006 | 8 |
| 2008 | 6 |
| 2009 | 7 |
| 2010 | 8 |
| 2011 | 9 |
| 2012 | 7 |
| 2013 | 13 |
| 2014 | 8 |
| 2015 | 11 |
| 2016 | 30 |
| 2017 | 22 |
| 2018 | 22 |
| 2019 | 8 |
| 2020 | 8 |
| 2021 | 17 |
| 2022 | 10 |
| 2023 | 15 |
| 2024 | 10 |