1983    -999    -999    -999    -999    -999    -999   -27.8   -25.2   -21.1   -24.6   -20.4   -15.1
1984   -11.8   -16.8   -16.4   -25.4   -20.5   -27.2   -27.6   -21.7   -24.6   -21.1   -22.0   -15.7
1985   -14.1   -16.5   -19.0   -21.6   -30.0    -999    -999    -999    -999    -999    -999    -999
1986    -999    -999    -999   -21.7   -24.6   -22.0   -24.9   -22.3   -22.8   -21.7   -19.7   -16.7
1987   -13.9   -14.2   -18.0   -21.6   -24.2   -20.2   -23.4   -24.8   -22.2   -20.4   -19.9   -17.2
1988   -16.5   -17.1   -22.2   -19.5   -25.5   -24.7   -23.0   -26.6   -22.0   -22.2   -21.8   -16.4
1989   -18.5   -18.3   -22.1   -21.1   -23.9   -27.8   -21.4   -22.9   -19.7   -20.1   -22.3   -16.9
1990   -15.3   -17.1   -22.3   -24.3   -22.1   -23.6   -18.1   -24.9   -23.7   -24.1   -17.9   -16.4
1991   -16.0   -16.2   -18.0    -999    -999    -999    -999    -999    -999    -999    -999    -999