| Year | Count |
|---|---|
| 1966 | 5 |
| 1972 | 12 |
| 1973 | 14 |
| 1973 | 36 |
| 1974 | 11 |
| 1974 | 40 |
| 1975 | 10 |
| 1975 | 28 |
| 1976 | 37 |
| 1977 | 13 |
| 1977 | 56 |
| 1978 | 13 |
| 1978 | 59 |
| 1979 | 50 |
| 1980 | 6 |
| 1980 | 53 |
| 1981 | 14 |
| 1981 | 53 |
| 1982 | 26 |
| 1983 | 6 |
| 1983 | 29 |
| 1984 | 16 |
| 1985 | 17 |
| 1986 | 23 |
| 1987 | 32 |
| 1988 | 5 |
| 1989 | 10 |
| 1991 | 18 |
| 1992 | 83 |
| 1993 | 43 |
| 1994 | 33 |
| 1996 | 16 |
| 1998 | 14 |
| 1999 | 14 |
| 2000 | 5 |
| 2001 | 12 |
| 2002 | 18 |
| 2003 | 10 |
| 2004 | 10 |
| 2005 | 10 |
| 2006 | 10 |
| 2007 | 5 |