| Year | Count |
|---|---|
| 1924 | 5 |
| 1955 | 5 |
| 1957 | 6 |
| 1958 | 6 |
| 1961 | 6 |
| 1962 | 5 |
| 1963 | 7 |
| 1965 | 7 |
| 1969 | 7 |
| 1970 | 6 |
| 1971 | 6 |
| 1972 | 6 |
| 1973 | 5 |
| 1975 | 5 |
| 1976 | 5 |
| 1977 | 6 |
| 1978 | 6 |
| 1979 | 6 |
| 1980 | 8 |
| 1981 | 8 |
| 1982 | 8 |
| 1983 | 10 |
| 1985 | 9 |
| 1986 | 17 |
| 1987 | 6 |
| 1988 | 12 |
| 1989 | 10 |
| 1990 | 8 |
| 1991 | 13 |
| 1992 | 7 |
| 1993 | 8 |
| 1994 | 13 |
| 1996 | 5 |
| 1997 | 8 |
| 2000 | 5 |
| 2001 | 5 |
| 2007 | 6 |
| 2012 | 6 |
| 2014 | 8 |
| 2015 | 10 |
| 2016 | 10 |
| 2017 | 18 |
| 2019 | 7 |
| 2023 | 5 |