| Year | Count |
|---|---|
| 1965 | 6 |
| 1967 | 12 |
| 1970 | 45 |
| 1971 | 10 |
| 1972 | 32 |
| 1973 | 49 |
| 1974 | 49 |
| 1975 | 61 |
| 1976 | 38 |
| 1977 | 83 |
| 1978 | 104 |
| 1979 | 93 |
| 1980 | 54 |
| 1981 | 99 |
| 1982 | 63 |
| 1983 | 23 |
| 1984 | 72 |
| 1985 | 80 |
| 1986 | 69 |
| 1987 | 92 |
| 1988 | 59 |
| 1989 | 61 |
| 1990 | 24 |
| 1991 | 24 |
| 1992 | 56 |
| 1993 | 42 |
| 1994 | 32 |
| 1995 | 29 |
| 1996 | 20 |
| 1997 | 21 |
| 1998 | 10 |
| 1999 | 9 |
| 2001 | 10 |
| 2004 | 5 |
| 2007 | 10 |
| 2008 | 6 |