| Year | Count |
|---|---|
| 1954 | 32 |
| 1955 | 21 |
| 1956 | 387 |
| 1957 | 184 |
| 1958 | 229 |
| 1959 | 181 |
| 1960 | 231 |
| 1961 | 200 |
| 1962 | 62 |
| 1963 | 118 |
| 1964 | 46 |
| 1965 | 87 |
| 1966 | 34 |
| 1967 | 88 |
| 1968 | 96 |
| 1969 | 49 |
| 1970 | 48 |
| 1971 | 35 |
| 1972 | 35 |
| 1973 | 24 |
| 1975 | 12 |
| 1976 | 10 |
| 1978 | 5 |
| 1979 | 5 |
| 1980 | 5 |
| 1981 | 18 |
| 1982 | 9 |
| 1983 | 5 |
| 1984 | 5 |
| 1986 | 10 |
| 1987 | 12 |
| 1988 | 5 |
| 1991 | 5 |
| 1995 | 6 |