| Year | Count |
|---|---|
| 1959 | 5 |
| 1966 | 10 |
| 1967 | 5 |
| 1969 | 6 |
| 1970 | 10 |
| 1971 | 12 |
| 1972 | 8 |
| 1973 | 5 |
| 1974 | 13 |
| 1976 | 9 |
| 1976 | 5 |
| 1977 | 7 |
| 1978 | 21 |
| 1979 | 5 |
| 1980 | 14 |
| 1980 | 15 |
| 1981 | 9 |
| 1982 | 18 |
| 1983 | 23 |
| 1984 | 48 |
| 1985 | 91 |
| 1985 | 5 |
| 1986 | 41 |
| 1986 | 10 |
| 1987 | 39 |
| 1988 | 53 |
| 1989 | 21 |
| 1989 | 5 |
| 1990 | 39 |
| 1990 | 20 |
| 1991 | 38 |
| 1991 | 6 |
| 1992 | 63 |
| 1992 | 10 |
| 1993 | 55 |
| 1993 | 5 |
| 1995 | 53 |
| 1996 | 31 |
| 1997 | 80 |
| 1998 | 21 |
| 1999 | 20 |
| 2000 | 12 |
| 2004 | 14 |
| 2009 | 6 |