| Year | Count |
|---|---|
| 1947 | 5 |
| 1951 | 28 |
| 1953 | 10 |
| 1954 | 48 |
| 1955 | 29 |
| 1956 | 63 |
| 1957 | 168 |
| 1958 | 233 |
| 1959 | 220 |
| 1960 | 219 |
| 1961 | 277 |
| 1962 | 210 |
| 1963 | 239 |
| 1964 | 223 |
| 1965 | 192 |
| 1966 | 220 |
| 1967 | 198 |
| 1968 | 168 |
| 1969 | 251 |
| 1970 | 297 |
| 1971 | 205 |
| 1972 | 147 |
| 1973 | 101 |
| 1974 | 78 |
| 1975 | 47 |
| 1976 | 23 |
| 1977 | 43 |
| 1978 | 22 |
| 1979 | 55 |
| 1980 | 21 |
| 1981 | 41 |
| 1982 | 31 |
| 1983 | 5 |
| 1985 | 5 |
| 1986 | 19 |
| 1988 | 10 |
| 1989 | 10 |