| Year | Count |
|---|---|
| 1950 | 15 |
| 1953 | 6 |
| 1954 | 58 |
| 1955 | 99 |
| 1956 | 172 |
| 1957 | 280 |
| 1958 | 332 |
| 1959 | 335 |
| 1960 | 321 |
| 1961 | 334 |
| 1962 | 294 |
| 1963 | 272 |
| 1964 | 286 |
| 1965 | 248 |
| 1966 | 248 |
| 1967 | 235 |
| 1968 | 265 |
| 1969 | 246 |
| 1970 | 233 |
| 1971 | 252 |
| 1972 | 178 |
| 1973 | 166 |
| 1974 | 183 |
| 1975 | 162 |
| 1976 | 140 |
| 1977 | 240 |
| 1978 | 112 |
| 1979 | 60 |
| 1980 | 48 |
| 1981 | 24 |
| 1982 | 43 |
| 1983 | 20 |
| 1984 | 21 |
| 1985 | 29 |
| 1986 | 52 |
| 1987 | 21 |
| 1988 | 10 |
| 1989 | 24 |
| 1990 | 5 |
| 1991 | 7 |
| 1992 | 5 |
| 1996 | 10 |
| 2004 | 10 |