| Year | Count |
|---|---|
| 1949 | 5 |
| 1951 | 6 |
| 1952 | 9 |
| 1953 | 23 |
| 1954 | 14 |
| 1955 | 18 |
| 1956 | 19 |
| 1957 | 48 |
| 1958 | 42 |
| 1959 | 71 |
| 1960 | 24 |
| 1961 | 43 |
| 1963 | 21 |
| 1964 | 19 |
| 1965 | 31 |
| 1966 | 35 |
| 1967 | 23 |
| 1968 | 37 |
| 1969 | 30 |
| 1970 | 50 |
| 1971 | 31 |
| 1972 | 43 |
| 1973 | 38 |
| 1974 | 25 |
| 1975 | 23 |
| 1976 | 23 |
| 1977 | 18 |
| 1978 | 23 |
| 1979 | 28 |
| 1980 | 25 |
| 1981 | 19 |
| 1982 | 22 |
| 1983 | 11 |
| 1984 | 19 |
| 1985 | 17 |
| 1986 | 24 |
| 1987 | 32 |
| 1988 | 10 |
| 1991 | 10 |
| 1992 | 43 |
| 1993 | 5 |
| 1995 | 15 |
| 1996 | 6 |
| 1997 | 22 |
| 1998 | 27 |
| 2001 | 12 |
| 2004 | 14 |
| 2017 | 15 |