| Year | Count |
|---|---|
| 1965 | 10 |
| 1968 | 11 |
| 1969 | 16 |
| 1970 | 36 |
| 1971 | 36 |
| 1972 | 23 |
| 1973 | 60 |
| 1974 | 60 |
| 1975 | 70 |
| 1976 | 83 |
| 1977 | 32 |
| 1978 | 60 |
| 1979 | 50 |
| 1980 | 46 |
| 1981 | 75 |
| 1982 | 38 |
| 1983 | 66 |
| 1984 | 77 |
| 1985 | 105 |
| 1986 | 81 |
| 1987 | 64 |
| 1988 | 94 |
| 1989 | 64 |
| 1990 | 130 |
| 1991 | 115 |
| 1992 | 85 |
| 1993 | 71 |
| 1994 | 42 |
| 1995 | 52 |
| 1996 | 8 |
| 1997 | 10 |
| 1998 | 39 |
| 1999 | 10 |
| 2000 | 5 |
| 2001 | 5 |
| 2002 | 10 |
| 2003 | 10 |