| Year | Count |
|---|---|
| 1948 | 8 |
| 1952 | 6 |
| 1954 | 7 |
| 1956 | 6 |
| 1957 | 8 |
| 1959 | 7 |
| 1963 | 5 |
| 1964 | 6 |
| 1966 | 11 |
| 1967 | 6 |
| 1968 | 6 |
| 1969 | 5 |
| 1970 | 7 |
| 1971 | 8 |
| 1972 | 7 |
| 1973 | 9 |
| 1974 | 9 |
| 1975 | 7 |
| 1976 | 6 |
| 1981 | 5 |
| 1982 | 6 |
| 1985 | 6 |
| 1986 | 5 |
| 1990 | 9 |
| 1992 | 8 |
| 1993 | 8 |
| 1994 | 9 |
| 1995 | 7 |
| 1997 | 7 |
| 1999 | 7 |
| 2000 | 6 |
| 2001 | 6 |
| 2002 | 9 |
| 2003 | 7 |
| 2004 | 7 |
| 2007 | 5 |
| 2009 | 6 |
| 2011 | 7 |
| 2024 | 5 |