| Year | Count |
|---|---|
| 1935 | 6 |
| 1955 | 5 |
| 1957 | 7 |
| 1959 | 5 |
| 1960 | 7 |
| 1961 | 7 |
| 1962 | 10 |
| 1963 | 6 |
| 1964 | 7 |
| 1966 | 10 |
| 1967 | 8 |
| 1969 | 7 |
| 1970 | 9 |
| 1972 | 7 |
| 1973 | 7 |
| 1974 | 14 |
| 1975 | 5 |
| 1976 | 8 |
| 1977 | 7 |
| 1978 | 9 |
| 1979 | 8 |
| 1980 | 8 |
| 1982 | 5 |
| 1983 | 8 |
| 1986 | 7 |
| 1987 | 8 |
| 1988 | 9 |
| 1989 | 6 |
| 1990 | 7 |
| 1991 | 10 |
| 1993 | 5 |
| 1994 | 5 |
| 1996 | 5 |
| 1997 | 5 |
| 2000 | 5 |
| 2002 | 5 |
| 2005 | 6 |
| 2007 | 5 |