| Year | Count |
|---|---|
| 1955 | 10 |
| 1956 | 22 |
| 1957 | 128 |
| 1958 | 230 |
| 1959 | 281 |
| 1960 | 351 |
| 1961 | 406 |
| 1962 | 327 |
| 1963 | 341 |
| 1964 | 162 |
| 1965 | 77 |
| 1966 | 14 |
| 1967 | 19 |
| 1968 | 16 |
| 1969 | 18 |
| 1970 | 20 |
| 1971 | 5 |
| 1972 | 10 |
| 1974 | 5 |
| 1979 | 10 |
| 1980 | 31 |
| 1981 | 46 |
| 1982 | 36 |
| 1983 | 5 |
| 1984 | 5 |
| 1985 | 17 |
| 1986 | 28 |
| 1987 | 9 |
| 1988 | 37 |
| 1989 | 28 |
| 1990 | 5 |
| 1991 | 7 |
| 1992 | 5 |
| 1993 | 16 |
| 1994 | 14 |
| 1995 | 11 |
| 1998 | 10 |
| 2000 | 5 |
| 2004 | 10 |
| 2011 | 5 |