| Year | Count |
|---|---|
| 1949 | 15 |
| 1950 | 67 |
| 1951 | 108 |
| 1952 | 133 |
| 1953 | 181 |
| 1954 | 142 |
| 1955 | 257 |
| 1956 | 188 |
| 1957 | 153 |
| 1958 | 88 |
| 1959 | 26 |
| 1960 | 47 |
| 1961 | 15 |
| 1962 | 47 |
| 1964 | 6 |
| 1965 | 8 |
| 1966 | 6 |
| 1968 | 18 |
| 1969 | 13 |
| 1970 | 24 |
| 1971 | 12 |
| 1972 | 24 |
| 1973 | 6 |
| 1974 | 7 |
| 1975 | 17 |
| 1977 | 5 |
| 1979 | 6 |
| 1985 | 6 |
| 1986 | 7 |
| 1987 | 19 |
| 1988 | 5 |
| 1989 | 5 |
| 1990 | 6 |
| 1992 | 15 |
| 1997 | 7 |
| 1998 | 6 |
| 2004 | 5 |
| 2007 | 5 |