1950 1 6.4 1950 2 5.57 1950 3 4.63 1950 4 4.23 1951 1 3.5 1951 2 3.1 1951 3 3.17 1951 4 3.37 1952 1 3.07 1952 2 2.97 1952 3 3.23 1952 4 2.83 1953 1 2.7 1953 2 2.57 1953 3 2.73 1953 4 3.7 1954 1 5.27 1954 2 5.8 1954 3 5.97 1954 4 5.33 1955 1 4.73 1955 2 4.4 1955 3 4.1 1955 4 4.23 1956 1 4.03 1956 2 4.2 1956 3 4.13 1956 4 4.13 1957 1 3.93 1957 2 4.1 1957 3 4.23 1957 4 4.93 1958 1 6.3 1958 2 7.37 1958 3 7.33 1958 4 6.37 1959 1 5.83 1959 2 5.1 1959 3 5.27 1959 4 5.6 1960 1 5.13 1960 2 5.23 1960 3 5.53 1960 4 6.27 1961 1 6.8 1961 2 7 1961 3 6.77 1961 4 6.2 1962 1 5.63 1962 2 5.53 1962 3 5.57 1962 4 5.53 1963 1 5.77 1963 2 5.73 1963 3 5.5 1963 4 5.57 1964 1 5.47 1964 2 5.2 1964 3 5 1964 4 4.97 1965 1 4.9 1965 2 4.67 1965 3 4.37 1965 4 4.1 1966 1 3.87 1966 2 3.83 1966 3 3.77 1966 4 3.7 1967 1 3.83 1967 2 3.83 1967 3 3.8 1967 4 3.9 1968 1 3.73 1968 2 3.57 1968 3 3.53 1968 4 3.4 1969 1 3.4 1969 2 3.43 1969 3 3.57 1969 4 3.57 1970 1 4.17 1970 2 4.77 1970 3 5.17 1970 4 5.83 1971 1 5.93 1971 2 5.9 1971 3 6.03 1971 4 5.93 1972 1 5.77 1972 2 5.7 1972 3 5.57 1972 4 5.37 1973 1 4.93 1973 2 4.93 1973 3 4.8 1973 4 4.77 1974 1 5.13 1974 2 5.2 1974 3 5.63 1974 4 6.6 1975 1 8.27 1975 2 8.87 1975 3 8.47 1975 4 8.3 1976 1 7.73 1976 2 7.57 1976 3 7.73 1976 4 7.77 1977 1 7.5 1977 2 7.13 1977 3 6.9 1977 4 6.67 1978 1 6.33 1978 2 6 1978 3 6.03 1978 4 5.9 1979 1 5.87 1979 2 5.7 1979 3 5.87 1979 4 5.97 1980 1 6.3 1980 2 7.33 1980 3 7.67 1980 4 7.4 1981 1 7.43 1981 2 7.4 1981 3 7.4 1981 4 8.23 1982 1 8.83 1982 2 9.43 1982 3 9.9 1982 4 10.67 1983 1 10.37 1983 2 10.13 1983 3 9.37 1983 4 8.53 1984 1 7.87 1984 2 7.43 1984 3 7.43 1984 4 7.3 1985 1 7.23 1985 2 7.3 1985 3 7.2 1985 4 7.03 1986 1 7.03 1986 2 7.17 1986 3 6.97 1986 4 6.83 1987 1 6.6 1987 2 6.27 1987 3 6 1987 4 5.83 1988 1 5.7 1988 2 5.47 1988 3 5.47 1988 4 5.33 1989 1 5.2 1989 2 5.23 1989 3 5.23 1989 4 5.37 1990 1 5.3 1990 2 5.33 1990 3 5.7 1990 4 6.13 1991 1 6.6 1991 2 6.83 1991 3 6.87 1991 4 7.1 1992 1 7.37 1992 2 7.6 1992 3 7.63 1992 4 7.37 1993 1 7.13 1993 2 7.07 1993 3 6.8 1993 4 6.63 1994 1 6.57 1994 2 6.2 1994 3 6 1994 4 5.63 1995 1 5.47 1995 2 5.67 1995 3 5.67 1995 4 5.57