| Year | Count |
|---|---|
| 1952 | 21 |
| 1953 | 16 |
| 1954 | 7 |
| 1955 | 41 |
| 1956 | 26 |
| 1957 | 20 |
| 1958 | 14 |
| 1959 | 25 |
| 1960 | 39 |
| 1962 | 29 |
| 1963 | 8 |
| 1964 | 21 |
| 1967 | 15 |
| 1968 | 10 |
| 1970 | 6 |
| 1971 | 5 |
| 1972 | 5 |
| 1975 | 5 |
| 1976 | 5 |
| 1977 | 15 |
| 1978 | 5 |
| 1979 | 19 |
| 1980 | 15 |
| 1981 | 6 |
| 1982 | 12 |
| 1983 | 15 |
| 1985 | 31 |
| 1986 | 16 |
| 1987 | 25 |
| 1988 | 19 |
| 1989 | 11 |
| 1990 | 13 |
| 1991 | 29 |
| 1992 | 7 |
| 1993 | 10 |
| 1994 | 6 |
| 1995 | 5 |
| 1996 | 11 |
| 1997 | 15 |
| 2000 | 7 |
| 2001 | 5 |
| 2005 | 5 |