29.8 1 1959 32.5 2 1959 29.2 3 1959 28.6 4 1959 31.5 1 1960 29.2 2 1960 27.9 3 1960 26.9 4 1960 26.2 1 1961 27.7 2 1961 29.3 3 1961 31.6 4 1961 32.2 1 1962 32.2 2 1962 33.2 3 1962 34 4 1962 33.6 1 1963 35.5 2 1963 36.4 3 1963 37.4 4 1963 40.6 1 1964 40.5 2 1964 41.6 3 1964 41.1 4 1964 46.8 1 1965 48.5 2 1965 49.1 3 1965 51.9 4 1965 53.1 1 1966 53.3 2 1966 52.9 3 1966 51.9 4 1966 49.6 1 1967 49.6 2 1967 50.6 3 1967 52.9 4 1967 51.5 1 1968 52.6 2 1968 52.8 3 1968 54.3 4 1968 53.7 1 1969 52 2 1969 50.4 3 1969 49.4 4 1969 46.8 1 1970 46.6 2 1970 47.2 3 1970 44.3 4 1970 51 1 1971 53 2 1971 56.6 3 1971 58.2 4 1971 62 1 1972 62.9 2 1972 65.6 3 1972 71.4 4 1972 82.3 1 1973 84.4 2 1973 84.6 3 1973 88.3 4 1973 92.8 1 1974 95.1 2 1974 101.2 3 1974 90.9 4 1974 80 1 1975 85.3 2 1975 102.3 3 1975 108.1 4 1975 113.5 1 1976 114.1 2 1976 114.8 3 1976 115.3 4 1976 126.8 1 1977 135.4 2 1977 140.9 3 1977 140.9 4 1977 144.3 1 1978 161 2 1978 165.2 3 1978 175.3 4 1978 176.4 1 1979 182.5 2 1979 186.6 3 1979 182.8 4 1979 184 1 1980 154.2 2 1980 162.2 3 1980 166 4 1980 170 1 1981 155.1 2 1981 159.1 3 1981 154.8 4 1981 133.3 1 1982 134.6 2 1982 132.8 3 1982 128.9 4 1982 131.2 1 1983 151.5 2 1983 164.1 3 1983 169.7 4 1983 178 1 1984 178 2 1984 165.7 3 1984 166.2 4 1984 153.7 1 1985 156.6 2 1985 160.4 3 1985 164.1 4 1985 133.2 1 1986 133.8 2 1986 136.2 3 1986 144.4 4 1986 164.6 1 1987 187.3 2 1987 195.6 3 1987 202.6 4 1987 225.4 1 1988 244.1 2 1988 249.1 3 1988 260.5 4 1988 249.3 1 1989 235.5 2 1989 223.4 3 1989 232.8 4 1989 250.7 1 1990 261.8 2 1990 264.7 3 1990 266.5 4 1990 281.1 1 1991 277.9 2 1991 280.9 3 1991 290.3 4 1991 314.2 1 1992 320.9 2 1992 281.9 3 1992 316.8 4 1992 325.6 1 1993 340.8 2 1993 343.5 3 1993 370.1 4 1993 349.4 1 1994 379.8 2 1994 401 3 1994 416.6 4 1994 440.1 1 1995 456.6 2 1995 464.8 3 1995 468.5 4 1995 493.5 1 1996 501 2 1996 500.9 3 1996 515.4 4 1996 534.4 1 1997 553.3 2 1997 575.3 3 1997 567.4 4 1997 548.9 1 1998 550.9 2 1998 535.8 3 1998 531 4 1998 570.1 1 1999 581.4 2 1999 598.6 3 1999