| Year | Count |
|---|---|
| 1920 | 5 |
| 1928 | 10 |
| 1934 | 5 |
| 1941 | 5 |
| 1948 | 5 |
| 1958 | 5 |
| 1961 | 8 |
| 1962 | 5 |
| 1963 | 11 |
| 1964 | 36 |
| 1965 | 34 |
| 1966 | 5 |
| 1967 | 11 |
| 1968 | 41 |
| 1969 | 71 |
| 1970 | 37 |
| 1971 | 79 |
| 1972 | 44 |
| 1973 | 80 |
| 1974 | 38 |
| 1975 | 22 |
| 1976 | 27 |
| 1977 | 20 |
| 1978 | 10 |
| 1979 | 46 |
| 1980 | 7 |
| 1981 | 12 |
| 1982 | 6 |
| 1985 | 6 |
| 1986 | 5 |
| 1988 | 5 |
| 1989 | 6 |