| Year | Count |
|---|---|
| 1954 | 5 |
| 1955 | 10 |
| 1956 | 5 |
| 1957 | 25 |
| 1958 | 16 |
| 1959 | 44 |
| 1961 | 30 |
| 1962 | 19 |
| 1963 | 47 |
| 1964 | 49 |
| 1965 | 18 |
| 1966 | 59 |
| 1967 | 66 |
| 1968 | 115 |
| 1969 | 147 |
| 1970 | 218 |
| 1971 | 252 |
| 1972 | 207 |
| 1973 | 233 |
| 1974 | 286 |
| 1975 | 210 |
| 1976 | 235 |
| 1977 | 223 |
| 1978 | 207 |
| 1979 | 277 |
| 1980 | 213 |
| 1981 | 216 |
| 1982 | 219 |
| 1983 | 306 |
| 1984 | 245 |
| 1985 | 348 |
| 1986 | 275 |
| 1987 | 292 |
| 1988 | 266 |
| 1989 | 244 |
| 1990 | 198 |
| 1991 | 119 |
| 1992 | 143 |
| 1993 | 134 |
| 1994 | 119 |
| 1995 | 58 |
| 1996 | 54 |
| 1997 | 58 |
| 1998 | 58 |
| 1999 | 57 |
| 2000 | 23 |
| 2001 | 17 |
| 2003 | 8 |
| 2006 | 7 |
| 2007 | 5 |
| 2011 | 6 |
| 2021 | 6 |