| Year | Count |
|---|---|
| 1967 | 37 |
| 1968 | 33 |
| 1969 | 40 |
| 1970 | 17 |
| 1971 | 6 |
| 1972 | 6 |
| 1973 | 31 |
| 1975 | 5 |
| 1977 | 30 |
| 1978 | 6 |
| 1979 | 23 |
| 1980 | 8 |
| 1981 | 16 |
| 1983 | 24 |
| 1984 | 8 |
| 1986 | 12 |
| 1987 | 26 |
| 1988 | 29 |
| 1989 | 6 |
| 1990 | 14 |
| 1991 | 12 |
| 1992 | 19 |
| 1993 | 62 |
| 1994 | 27 |
| 1995 | 35 |
| 1996 | 6 |
| 1997 | 14 |
| 1998 | 46 |
| 1999 | 5 |
| 2002 | 15 |
| 2004 | 56 |
| 2005 | 24 |
| 2006 | 6 |
| 2007 | 22 |
| 2008 | 6 |
| 2010 | 7 |
| 2024 | 6 |