| Year | Count |
|---|---|
| 1952 | 5 |
| 1953 | 8 |
| 1955 | 6 |
| 1957 | 8 |
| 1958 | 8 |
| 1959 | 9 |
| 1960 | 9 |
| 1961 | 10 |
| 1964 | 5 |
| 1965 | 5 |
| 1967 | 9 |
| 1968 | 5 |
| 1969 | 9 |
| 1970 | 5 |
| 1972 | 5 |
| 1973 | 12 |
| 1974 | 9 |
| 1975 | 8 |
| 1976 | 8 |
| 1977 | 11 |
| 1978 | 6 |
| 1979 | 11 |
| 1981 | 6 |
| 1982 | 8 |
| 1983 | 6 |
| 1985 | 6 |
| 1986 | 6 |
| 1987 | 9 |
| 1988 | 6 |
| 1991 | 5 |
| 1997 | 7 |
| 1999 | 10 |
| 2000 | 8 |
| 2002 | 5 |
| 2003 | 8 |
| 2005 | 8 |
| 2006 | 8 |
| 2007 | 5 |
| 2008 | 8 |
| 2009 | 6 |
| 2010 | 6 |
| 2011 | 5 |
| 2012 | 6 |
| 2013 | 8 |
| 2014 | 8 |
| 2015 | 10 |
| 2017 | 12 |
| 2018 | 12 |
| 2020 | 7 |
| 2023 | 9 |
| 2024 | 5 |