| Year | Count |
|---|---|
| 1953 | 5 |
| 1957 | 5 |
| 1959 | 12 |
| 1960 | 7 |
| 1961 | 6 |
| 1963 | 23 |
| 1964 | 33 |
| 1968 | 10 |
| 1969 | 8 |
| 1970 | 7 |
| 1971 | 6 |
| 1972 | 5 |
| 1973 | 16 |
| 1974 | 5 |
| 1976 | 19 |
| 1977 | 15 |
| 1978 | 25 |
| 1979 | 12 |
| 1980 | 10 |
| 1982 | 11 |
| 1983 | 17 |
| 1985 | 5 |
| 1986 | 27 |
| 1987 | 17 |
| 1989 | 6 |
| 1991 | 5 |
| 1992 | 5 |
| 1993 | 6 |
| 1994 | 5 |
| 1995 | 10 |
| 2000 | 9 |
| 2001 | 5 |
| 2004 | 5 |