1980 -999 -999 -999 -8.9 -10.3 -25.0 -13.7 -17.9 -21.2 -14.8 -11.4 -5.9 1981 -5.6 -9.5 -9.5 -18.0 -19.4 -21.3 -22.2 -28.7 -23.1 -15.5 -11.9 -4.9 1982 -2.4 -7.5 -13.5 -24.9 -21.0 -20.1 -22.6 -21.7 -22.1 -19.3 -9.5 -4.0 1983 -6.1 -9.9 -10.0 -12.0 -12.3 -23.6 -25.5 -27.2 -20.6 -18.4 -11.5 -5.4 1984 -5.2 -6.9 -9.8 -15.4 -17.9 -16.8 -32.6 -31.8 -28.3 -15.9 -10.0 -3.6 1985 -4.1 -9.9 -12.5 -16.1 -15.4 -27.5 -33.9 -26.8 -24.0 -19.6 -10.0 -6.4 1986 -5.0 -7.2 -12.8 -18.4 -14.5 -22.3 -27.5 -29.4 -30.2 -18.8 -12.0 -5.9 1987 -4.4 -8.7 -19.5 -16.4 -16.4 -18.7 -19.0 -22.9 -22.2 -17.6 -13.7 -4.4 1988 -5.0 -8.9 -14.5 -11.8 -15.6 -18.1 -19.1 -17.7 -19.6 -15.6 -9.0 -4.9 1989 -3.4 -7.1 -10.9 -10.7 -25.8 -23.4 -26.1 -26.2 -26.4 -16.9 -10.3 -4.8 1990 -3.3 -3.8 -999 -999 -999 -999 -999 -999 -999 -999 -999 -999