| Year | Count |
|---|---|
| 1953 | 5 |
| 1961 | 6 |
| 1962 | 6 |
| 1963 | 5 |
| 1965 | 6 |
| 1966 | 60 |
| 1967 | 29 |
| 1968 | 28 |
| 1969 | 60 |
| 1970 | 34 |
| 1971 | 54 |
| 1972 | 25 |
| 1973 | 40 |
| 1975 | 18 |
| 1976 | 6 |
| 1977 | 36 |
| 1977 | 15 |
| 1978 | 15 |
| 1979 | 19 |
| 1981 | 10 |
| 1982 | 8 |
| 1984 | 14 |
| 1985 | 5 |
| 1986 | 38 |
| 1987 | 51 |
| 1988 | 54 |
| 1989 | 52 |
| 1990 | 70 |
| 1991 | 34 |
| 1992 | 41 |
| 1993 | 62 |
| 1994 | 31 |
| 1995 | 10 |
| 1996 | 26 |
| 1997 | 39 |
| 1998 | 35 |
| 1999 | 10 |
| 2000 | 7 |
| 2006 | 10 |
| 2013 | 6 |