| Year | Count |
|---|---|
| 1952 | 5 |
| 1953 | 8 |
| 1954 | 8 |
| 1955 | 11 |
| 1956 | 14 |
| 1957 | 16 |
| 1958 | 32 |
| 1959 | 18 |
| 1960 | 20 |
| 1961 | 28 |
| 1963 | 13 |
| 1965 | 12 |
| 1966 | 10 |
| 1967 | 5 |
| 1968 | 10 |
| 1969 | 9 |
| 1970 | 11 |
| 1972 | 5 |
| 1973 | 7 |
| 1975 | 14 |
| 1976 | 12 |
| 1978 | 12 |
| 1982 | 6 |
| 1983 | 5 |
| 1984 | 6 |
| 1988 | 5 |
| 1989 | 6 |
| 1992 | 8 |
| 1993 | 8 |
| 1994 | 10 |
| 1995 | 5 |
| 1996 | 6 |
| 1998 | 5 |
| 2000 | 6 |
| 2001 | 8 |
| 2003 | 5 |
| 2005 | 5 |
| 2009 | 5 |
| 2012 | 5 |
| 2021 | 10 |