1980 -999 -999 -999 7.1 6.3 6.5 8.3 6.0 4.1 7.1 5.2 6.6 1981 5.1 3.7 6.5 4.6 4.1 3.6 3.5 1.7 4.3 4.6 3.7 5.1 1982 4.0 3.0 3.6 2.8 3.4 3.9 2.8 3.7 4.2 4.7 5.1 7.0 1983 5.0 4.0 3.5 3.6 2.8 3.1 2.5 2.6 3.5 3.4 3.9 3.4 1984 3.5 5.3 5.0 3.5 4.4 5.3 3.0 2.2 2.7 4.0 3.8 4.6 1985 3.9 3.9 1.8 2.7 3.0 0.7 2.5 1.0 2.5 3.2 4.1 2.7 1986 3.5 2.0 1.3 1.1 0.8 0.9 0.1 0.4 0.0 1.7 2.4 2.2 1987 1.7 3.2 3.1 2.2 1.8 1.9 3.8 3.2 3.3 3.7 2.9 3.0 1988 5.6 3.1 2.5 3.7 1.3 1.9 2.0 3.4 1.5 2.0 2.1 3.8 1989 3.7 2.9 5.4 4.3 3.6 3.2 2.8 3.7 3.3 3.9 5.4 4.4 1990 7.0 5.0 -999 -999 -999 -999 -999 -999 -999 -999 -999 -999