| Year | Count |
|---|---|
| 1958 | 5 |
| 1967 | 12 |
| 1968 | 5 |
| 1969 | 30 |
| 1970 | 35 |
| 1971 | 74 |
| 1972 | 22 |
| 1973 | 33 |
| 1974 | 42 |
| 1975 | 49 |
| 1976 | 20 |
| 1977 | 38 |
| 1978 | 30 |
| 1979 | 19 |
| 1980 | 25 |
| 1981 | 11 |
| 1982 | 10 |
| 1983 | 18 |
| 1984 | 19 |
| 1985 | 10 |
| 1986 | 28 |
| 1987 | 17 |
| 1988 | 38 |
| 1989 | 10 |
| 1990 | 69 |
| 1991 | 12 |
| 1992 | 24 |
| 1994 | 23 |
| 1995 | 5 |
| 1996 | 11 |
| 1998 | 21 |
| 1999 | 5 |
| 2000 | 12 |
| 2003 | 10 |
| 2005 | 20 |
| 2006 | 5 |
| 2013 | 5 |