| Year | Count |
|---|---|
| 1953 | 10 |
| 1955 | 5 |
| 1956 | 27 |
| 1957 | 57 |
| 1958 | 56 |
| 1959 | 117 |
| 1960 | 146 |
| 1961 | 145 |
| 1962 | 167 |
| 1963 | 197 |
| 1964 | 190 |
| 1965 | 162 |
| 1966 | 179 |
| 1967 | 261 |
| 1968 | 382 |
| 1969 | 410 |
| 1970 | 416 |
| 1971 | 443 |
| 1972 | 389 |
| 1973 | 402 |
| 1974 | 509 |
| 1975 | 595 |
| 1976 | 624 |
| 1977 | 501 |
| 1978 | 443 |
| 1979 | 361 |
| 1980 | 266 |
| 1981 | 519 |
| 1982 | 357 |
| 1983 | 294 |
| 1984 | 263 |
| 1985 | 333 |
| 1986 | 270 |
| 1987 | 298 |
| 1988 | 314 |
| 1989 | 223 |
| 1990 | 152 |
| 1991 | 205 |
| 1992 | 105 |
| 1993 | 119 |
| 1994 | 157 |
| 1995 | 65 |
| 1996 | 37 |
| 1997 | 32 |
| 1998 | 27 |
| 2000 | 5 |
| 2011 | 10 |
| 2021 | 29 |
| 2022 | 23 |