1980    -999    -999    -999    -7.2    -8.2   -19.4   -10.8   -13.6   -16.7   -11.7    -9.2    -4.2
1981    -3.8    -7.1    -7.7   -14.1   -16.2   -18.1   -18.3   -25.1   -19.3   -12.4    -9.6    -3.3
1982    -0.7    -5.7   -11.3   -21.9   -18.0   -16.4   -18.5   -17.7   -18.2   -15.4    -7.3    -2.2
1983    -3.8    -7.2    -8.3    -9.9    -9.8   -19.9   -21.1   -22.8   -16.6   -15.6    -9.4    -3.5
1984    -2.7    -5.4    -7.4   -12.3   -14.8   -13.2   -28.5   -25.2   -22.9   -12.8    -7.8    -1.7
1985    -2.2    -7.8    -9.7   -12.4   -13.0   -23.5   -27.2   -22.3   -19.8   -16.2    -7.8    -4.2
1986    -3.0    -5.0   -10.4   -14.9   -12.6   -18.5   -21.9   -24.1   -25.4   -15.4    -9.4    -4.2
1987    -2.2    -6.4   -16.2   -14.0   -13.1   -15.4   -15.5   -18.3   -17.7   -14.5   -10.7    -2.4
1988    -3.2    -6.3   -11.4    -9.5   -12.9   -14.2   -15.0   -13.8   -16.0   -12.7    -7.1    -3.3
1989    -2.0    -5.0    -7.8    -8.6   -21.1   -19.3   -20.8   -21.8   -22.5   -13.5    -7.8    -3.0
1990    -1.5    -1.9    -999    -999    -999    -999    -999    -999    -999    -999    -999    -999