| Year | Count |
|---|---|
| 1952 | 15 |
| 1967 | 14 |
| 1970 | 10 |
| 1971 | 24 |
| 1972 | 16 |
| 1973 | 5 |
| 1974 | 5 |
| 1975 | 25 |
| 1976 | 25 |
| 1977 | 41 |
| 1978 | 23 |
| 1979 | 16 |
| 1980 | 32 |
| 1981 | 18 |
| 1982 | 20 |
| 1983 | 35 |
| 1984 | 5 |
| 1985 | 60 |
| 1986 | 22 |
| 1987 | 27 |
| 1988 | 20 |
| 1989 | 27 |
| 1990 | 14 |
| 1991 | 17 |
| 1992 | 15 |
| 1993 | 34 |
| 1994 | 10 |
| 1995 | 8 |
| 1996 | 7 |
| 1997 | 16 |
| 1998 | 10 |
| 2005 | 10 |