1971    -999    -999     4.4     4.1     2.6     2.6     4.7     3.5     3.6     3.2     3.2     6.0
1972     8.2     5.9     5.6     6.8     3.0     2.5     3.8     3.3     4.0     3.8     4.4     7.4
1973     7.6     5.2     4.9     3.8     4.9     4.9     3.9     5.1     2.7     1.9     5.0     3.8
1974     4.8     6.4     5.6     4.8     4.2     6.1     3.6     4.0     4.3     1.5     3.8     4.8
1975     5.6     6.1     4.8     4.7     1.8     3.4     2.0     3.4     3.5     3.2     5.4     5.6
1976     5.7     4.8     6.2     5.6     5.2     3.0     3.0     3.9     2.9     3.2     3.8     6.4
1977     4.7     6.6     6.0     6.4     2.8     6.2     1.1     4.9     4.7     1.8     3.3     5.7
1978     4.7     5.2     5.7     7.3     3.4     3.1     3.6     5.2     3.9     4.0     6.9     4.3
1979     6.9     6.2     3.9     3.8     2.7     2.7     2.5     1.6     4.2     4.4     3.8     5.4
1980     4.3     4.7     5.8    -999     5.1     3.0     0.8     2.4     2.2     3.5     4.0     4.6
1981     5.3     4.2     4.2     4.7     3.3     1.2     1.5     0.4     1.6     3.3     2.2     3.4
1982     3.9     5.9     4.4     3.9     2.9     2.2     3.0     3.4     5.0     3.7     4.1     4.0
1983     7.0     6.6     6.0     4.8     3.9     3.2     4.1     2.2     3.1     2.7     2.8     5.5
1984     4.8     2.6     4.0     3.7     3.0     1.3     0.7     2.2     4.0     3.5     3.6     3.4
1985     3.7     6.3     4.3     6.1     5.5     2.4     3.6     2.3     2.8     2.6     4.3     3.4
1986     4.7     3.1     6.5     4.4     2.5     4.0     2.6     2.0     3.4     3.1     2.8     1.7
1987     3.6     5.9     4.9     3.6     2.7     2.3     2.8     2.7     1.6     2.2     3.8     3.5
1988     4.2     5.4     6.6     5.0     3.2     2.8     3.0     3.0     1.9     2.7     3.2     4.5
1989     4.0     3.5     5.6     3.6     3.9     2.9     3.0     1.8     1.9     2.9     2.8     3.1
1990     2.6    -999    -999     1.6     0.7     0.2     1.2     0.3     0.9     0.3     0.9     1.6
1991     2.4     1.1    -999    -999    -999    -999    -999    -999    -999    -999    -999    -999