1980    -999    -999    -999    17.2    17.7    15.3    16.2    17.1    10.3    16.8     9.3     7.7
1981    10.7     9.0    21.4    11.8    14.1    14.8    13.7     6.4    13.0    15.5    13.7    13.3
1982     9.3    10.8    14.8     8.1    12.7    15.8    15.3    16.4    13.9    10.1    14.0     8.5
1983     9.1     8.7    18.5    22.0    19.5    13.9    10.7    14.5    11.1    18.6    13.6    11.8
1984     6.7    12.6    11.1    12.7    15.9    18.1    13.2    10.0    10.5    13.4     9.2     9.4
1985    11.1    10.7    14.2    13.6    16.6    11.9     8.6    11.0    10.6    14.0    10.7     9.1
1986    10.6    10.1    12.0    13.6    17.6     9.4    12.3    10.5    10.7    15.4    11.8    13.7
1987     8.0     9.7     9.8    15.9    15.6    15.1    16.1    14.1    13.6    10.3     8.4    10.3
1988    10.7     7.8    12.3    19.3    13.8    14.7    14.1    16.5    11.7    13.4    14.9    12.7
1989    13.5    10.7    14.0    16.5    14.1    13.0    11.8    12.8    13.4    14.0    13.9    12.5
1990    12.0    11.7    -999    -999    -999    -999    -999    -999    -999    -999    -999    -999