| Year | Count |
|---|---|
| 1953 | 46 |
| 1954 | 773 |
| 1955 | 1,488 |
| 1956 | 1,678 |
| 1957 | 1,081 |
| 1958 | 620 |
| 1959 | 506 |
| 1960 | 229 |
| 1961 | 276 |
| 1962 | 166 |
| 1963 | 118 |
| 1964 | 213 |
| 1965 | 133 |
| 1966 | 167 |
| 1967 | 158 |
| 1968 | 112 |
| 1969 | 150 |
| 1970 | 178 |
| 1971 | 238 |
| 1972 | 201 |
| 1973 | 237 |
| 1974 | 226 |
| 1975 | 262 |
| 1976 | 220 |
| 1977 | 297 |
| 1978 | 313 |
| 1979 | 325 |
| 1980 | 264 |
| 1981 | 228 |
| 1982 | 259 |
| 1983 | 234 |
| 1984 | 177 |
| 1985 | 281 |
| 1986 | 161 |
| 1987 | 168 |
| 1988 | 153 |
| 1989 | 111 |
| 1990 | 130 |
| 1991 | 65 |
| 1992 | 20 |
| 1993 | 50 |
| 1995 | 5 |
| 1996 | 5 |
| 1997 | 18 |