1963 -999 -999 -14.0 -14.2 -17.3 -19.1 -22.4 -19.9 -17.8 -19.4 -11.0 -5.7 1964 -3.3 -9.0 -12.0 -14.3 -19.0 -20.7 -18.2 -18.2 -22.6 -18.3 -9.6 -4.4 1965 -3.7 -7.1 -11.7 -12.9 -14.2 -18.8 -26.1 -22.9 -24.8 -18.7 -13.7 -4.5 1966 -4.8 -8.5 -11.3 -18.1 -16.4 -21.5 -23.6 -24.9 -19.9 -20.8 -10.5 -4.2 1967 -3.3 -8.6 -10.6 -13.7 -15.0 -18.0 -20.5 -22.0 -21.5 -16.1 -8.8 -4.7 1968 -4.1 -7.7 -9.9 -13.0 -15.9 -19.2 -22.4 -20.2 -22.3 -17.4 -10.4 -6.0 1969 -3.2 -4.8 -10.0 -14.0 -16.9 -17.3 -21.3 -26.1 -22.9 -17.4 -10.0 -4.6 1970 -3.9 -7.3 -8.1 -13.4 -16.9 -21.0 -20.8 -24.8 -24.4 -15.2 -10.2 -4.5 1971 -3.5 -5.2 -12.3 -15.4 -20.2 -21.8 -23.2 -23.8 -19.8 -16.1 -10.8 -4.0 1972 -2.7 -6.3 -12.6 -13.6 -18.1 -21.1 -21.2 -19.6 -19.3 -16.9 -11.6 -6.5 1973 -4.3 -8.5 -13.1 -14.1 -15.0 -18.5 -23.0 -26.7 -20.8 -15.5 -10.3 -0.6 1974 -5.2 -6.6 -12.6 -14.6 -17.4 -19.5 -20.5 -21.3 -19.9 -16.2 -10.0 -3.2 1975 -3.0 -7.8 -11.3 -15.8 -17.6 -18.9 -22.8 -23.9 -22.1 -16.4 -9.7 -6.0 1976 -4.0 -7.6 -10.8 -15.1 -18.0 -22.4 -24.0 -24.5 -23.6 -18.8 -10.3 -2.7 1977 -1.5 -6.3 -11.3 -17.4 -17.0 -19.2 -16.8 -16.9 -22.0 -17.9 -11.1 -4.4 1978 -4.6 -6.3 -12.0 -13.3 -14.9 -19.6 -18.2 -23.8 -19.2 -16.1 -11.3 -4.8 1979 -3.3 -7.1 -11.7 -11.4 -18.0 -21.4 -23.6 -23.4 -21.0 -17.8 -8.5 -5.2 1980 -2.1 -7.4 -10.3 -12.2 -17.3 -18.1 -18.4 -20.9 -18.2 -16.8 -8.5 -3.4 1981 -4.9 -6.7 -9.7 -14.7 -17.5 -19.7 -18.9 -19.5 -23.1 -18.7 -10.5 -5.0 1982 -5.5 -8.3 -10.0 -15.9 -19.3 -20.0 -21.5 -24.8 -23.5 -18.8 -8.9 -4.1 1983 -2.9 -7.8 -12.3 -16.0 -17.7 -19.0 -20.5 -22.8 -18.4 -16.2 -12.2 -7.7 1984 -3.6 -7.9 -10.9 -16.4 -15.2 -20.8 -25.6 -22.3 -20.1 -19.8 -11.2 -3.9 1985 -1.7 -0.7 -11.8 -13.9 -19.8 -17.6 -21.7 -25.6 -19.8 -17.2 -12.1 -6.4 1986 -5.5 -4.3 -9.1 -15.6 -17.6 -19.9 -22.2 -21.8 -17.5 -18.2 -9.7 -4.4 1987 -2.5 -5.4 -9.9 -12.3 -18.6 -16.1 -20.0 -24.6 -23.4 -17.6 -9.0 -4.6 1988 -3.4 -7.8 -10.6 -16.6 -16.2 -18.2 -19.7 -19.9 -19.1 -16.1 -10.6 -6.4 1989 -4.3 -6.1 -12.6 -16.7 -21.2 -20.4 -21.1 -22.2 -24.6 -15.8 -10.3 -4.1 1990 -2.7 -7.4 -10.2 -13.8 -17.3 -20.4 -14.8 -25.2 -26.3 -14.6 -10.7 -4.3 1991 -3.5 -6.5 -9.7 -14.0 -16.0 -17.6 -18.8 -19.7 -19.7 -18.6 -11.3 -2.6 1992 -2.8 -6.0 -10.0 -11.5 -15.5 -15.6 -18.5 -20.1 -23.3 -16.3 -9.2 -5.2 1993 -3.0 -7.9 -12.2 -16.1 -19.9 -21.6 -23.9 -24.5 -20.8 -17.2 -11.2 -5.2 1994 -4.3 -8.4 -12.7 -15.0 -17.7 -15.4 -16.9 -22.0 -20.0 -15.8 -10.0 -5.7 1995 -6.1 -6.8 -13.0 -11.3 -17.2 -22.6 -15.9 -23.6 -24.1 -16.3 -11.0 -5.5 1996 -4.0 -5.5 -10.7 -15.1 -999 -999 -18.9 -18.9 -15.1 -14.3 -9.8 -4.6 1997 -4.6 -6.4 -11.4 -13.1 -18.0 -17.2 -21.8 -20.2 -25.9 -15.9 -11.3 -3.0 1998 -3.3 -6.5 -10.0 -16.9 -17.2 -18.2 -19.6 -25.2 -20.2 -18.8 -9.7 -6.3 1999 -4.9 -8.4 -11.5 -15.0 -17.0 -17.9 -999 -999 -999 -999 -999 -999