| Year | Count |
|---|---|
| 1955 | 5 |
| 1957 | 18 |
| 1959 | 26 |
| 1961 | 6 |
| 1963 | 5 |
| 1964 | 5 |
| 1966 | 8 |
| 1967 | 5 |
| 1969 | 5 |
| 1970 | 6 |
| 1971 | 6 |
| 1975 | 5 |
| 1976 | 9 |
| 1978 | 10 |
| 1979 | 18 |
| 1981 | 8 |
| 1982 | 8 |
| 1983 | 6 |
| 1984 | 9 |
| 1986 | 8 |
| 1988 | 5 |
| 1989 | 8 |
| 1990 | 6 |
| 1991 | 9 |
| 1992 | 5 |
| 1993 | 7 |
| 1994 | 6 |
| 1996 | 7 |
| 1997 | 5 |
| 1998 | 7 |
| 2006 | 6 |
| 2012 | 7 |
| 2014 | 14 |
| 2016 | 21 |
| 2018 | 10 |
| 2022 | 14 |
| 2023 | 10 |