| Year | Count |
|---|---|
| 1953 | 25 |
| 1954 | 6 |
| 1955 | 33 |
| 1956 | 11 |
| 1957 | 52 |
| 1958 | 45 |
| 1959 | 42 |
| 1960 | 75 |
| 1961 | 45 |
| 1962 | 114 |
| 1963 | 66 |
| 1964 | 93 |
| 1965 | 83 |
| 1966 | 86 |
| 1967 | 105 |
| 1968 | 102 |
| 1969 | 66 |
| 1970 | 61 |
| 1971 | 41 |
| 1972 | 73 |
| 1973 | 23 |
| 1974 | 33 |
| 1975 | 25 |
| 1978 | 16 |
| 1979 | 12 |
| 1980 | 12 |
| 1981 | 13 |
| 1983 | 13 |
| 1984 | 5 |
| 1985 | 5 |
| 1987 | 5 |
| 1993 | 5 |