| Year | Count |
|---|---|
| 1947 | 5 |
| 1949 | 5 |
| 1950 | 8 |
| 1951 | 34 |
| 1952 | 21 |
| 1953 | 57 |
| 1954 | 101 |
| 1955 | 95 |
| 1956 | 126 |
| 1957 | 171 |
| 1958 | 211 |
| 1959 | 260 |
| 1960 | 201 |
| 1961 | 282 |
| 1962 | 268 |
| 1963 | 280 |
| 1964 | 308 |
| 1965 | 363 |
| 1966 | 360 |
| 1967 | 546 |
| 1968 | 494 |
| 1969 | 546 |
| 1970 | 720 |
| 1971 | 928 |
| 1972 | 650 |
| 1973 | 574 |
| 1974 | 554 |
| 1975 | 450 |
| 1976 | 336 |
| 1977 | 390 |
| 1978 | 387 |
| 1979 | 469 |
| 1980 | 421 |
| 1981 | 386 |
| 1982 | 259 |
| 1983 | 224 |
| 1984 | 204 |
| 1985 | 217 |
| 1986 | 83 |
| 1987 | 107 |
| 1988 | 114 |
| 1989 | 99 |
| 1990 | 49 |
| 1991 | 78 |
| 1992 | 32 |
| 1993 | 14 |
| 1994 | 5 |
| 1995 | 7 |
| 1997 | 6 |
| 2004 | 10 |
| 2017 | 5 |
| 2024 | 5 |