1983    -999    -999    -999    -999    -999    -999   -23.7   -22.8   -17.2   -19.1   -14.1    -7.9
1984    -6.9   -10.6   -11.6   -19.1   -16.9   -22.7   -24.3   -18.5   -20.5   -16.2   -14.6    -9.1
1985    -7.6    -9.6   -12.6   -17.9   -23.6    -999    -999    -999    -999    -999    -999    -999
1986    -999    -999    -999   -14.0   -18.5   -18.1   -19.7   -18.4   -21.1   -17.2   -13.1    -9.7
1987    -8.2    -8.9   -11.3   -15.6   -20.5   -15.7   -19.4   -21.0   -18.6   -15.6   -14.3   -11.2
1988   -10.3   -11.1   -14.7   -15.3   -20.8   -20.2   -20.5   -21.5   -17.5   -16.3   -14.0    -8.9
1989    -9.9   -11.6   -14.7   -16.5   -20.6   -24.4   -18.1   -20.1   -16.0   -17.0   -14.8    -9.0
1990    -8.7   -10.1   -14.0   -20.3   -17.7   -19.2   -13.7   -21.8   -22.8   -18.3   -12.1    -8.3
1991    -8.2   -10.3   -10.5    -999    -999    -999    -999    -999    -999    -999    -999    -999