| Year | Count |
|---|---|
| 1953 | 55 |
| 1954 | 60 |
| 1955 | 118 |
| 1956 | 175 |
| 1957 | 203 |
| 1958 | 196 |
| 1959 | 202 |
| 1960 | 234 |
| 1961 | 121 |
| 1962 | 128 |
| 1963 | 92 |
| 1964 | 66 |
| 1965 | 20 |
| 1966 | 28 |
| 1967 | 24 |
| 1968 | 11 |
| 1969 | 11 |
| 1970 | 5 |
| 1971 | 6 |
| 1972 | 15 |
| 1973 | 13 |
| 1974 | 35 |
| 1975 | 74 |
| 1976 | 90 |
| 1977 | 193 |
| 1978 | 215 |
| 1979 | 334 |
| 1980 | 330 |
| 1981 | 193 |
| 1982 | 117 |
| 1983 | 61 |
| 1984 | 14 |
| 1985 | 15 |