| Year | Count |
|---|---|
| 1947 | 12 |
| 1948 | 29 |
| 1951 | 44 |
| 1952 | 25 |
| 1953 | 29 |
| 1954 | 62 |
| 1955 | 41 |
| 1956 | 100 |
| 1957 | 123 |
| 1958 | 120 |
| 1959 | 125 |
| 1960 | 200 |
| 1961 | 196 |
| 1962 | 95 |
| 1963 | 72 |
| 1964 | 43 |
| 1965 | 55 |
| 1966 | 87 |
| 1967 | 39 |
| 1968 | 60 |
| 1969 | 100 |
| 1970 | 55 |
| 1971 | 22 |
| 1972 | 28 |
| 1973 | 37 |
| 1974 | 40 |
| 1975 | 29 |
| 1976 | 7 |
| 1977 | 10 |
| 1978 | 5 |
| 1987 | 12 |