1963    -999    -999     6.5     7.6     6.9     6.9     6.2     5.8     7.2     6.6     6.6     6.1
1964     8.0     5.1     7.4     6.9     6.8     4.0     7.2     6.9     7.5     5.6     5.6     4.7
1965     6.6     5.9     7.7     8.0     8.3     7.8     5.9     6.7     7.2     7.1     6.4     5.4
1966     8.0     6.1     7.8     6.0     6.0     6.0     4.2     7.0     6.2     6.2     7.4     6.8
1967     5.9     6.4     7.6     8.1     7.3     7.0     6.2     7.8     5.6     7.2     7.6     7.0
1968     6.2     7.2     8.4     8.5     7.0     6.6     7.0     8.7     6.7     6.4     6.3     6.4
1969     6.6     8.1     7.3     7.4     7.1     7.4     7.5     6.4     7.2     5.6     6.4     5.7
1970     7.1     7.4     7.9     7.7     7.3     8.2     7.0     7.1     5.1     7.0     6.8     6.9
1971     7.2     8.2     7.7     7.8     5.5     6.7     5.9     6.5     5.8     7.6     8.3     5.1
1972     7.4     8.0     7.6     7.4     7.5     6.8     8.1     7.8     8.4     8.0     7.5     7.1
1973     6.9     7.0     6.8     7.7     7.0     6.6     6.0     5.4     7.1     6.5     4.8     6.1
1974     5.0     7.5     7.1     8.4     6.8     4.4     7.5     6.1     8.1     6.4     5.5     6.8
1975     5.0     7.8     8.6     8.7     7.2     7.6     8.0     8.1     8.0     8.6     7.2     5.3
1976     5.9     8.7     8.7     8.2     8.2     5.7     5.8     6.7     7.1     6.6     6.5     5.1
1977     6.4     6.7     8.3     7.1     5.2     5.6     7.3     8.9     8.3     7.4     8.0     5.8
1978     8.0     7.7     7.7     7.4     7.2     6.1     6.8     6.9     7.8     8.3     6.8     7.2
1979     7.0     8.0     8.1     7.8     6.3     6.4     8.0     7.4     6.0     5.5     7.2     4.7
1980     9.0     7.5     7.3     7.1     6.5     6.5     4.3     5.5     5.1     7.3     6.6     7.8
1981     5.5     7.4     7.4     8.1     7.1     7.0     7.0     6.0     6.0     8.3     7.0     7.7
1982     6.2     6.7     8.9     6.8     6.5     7.2     6.6     6.5     7.0     5.6     7.0     6.7
1983     6.8     7.3     7.7     7.7     6.9     6.5     6.6     6.9     6.9     7.0     6.8     6.2
1984     6.8     6.3     8.5     7.5     6.7     6.2     2.9     7.7     7.0     7.1     6.9     5.2
1985     7.6     8.1     6.6     7.7     6.9     7.3     7.9     5.6     7.4     7.2     7.2     7.2
1986     5.6     6.8     7.9     8.1     4.9     7.0     5.3     7.1     7.8     6.3     7.6     7.4
1987     6.3     6.5     7.3     8.2     5.8     4.9     4.7     5.3     6.2     5.4     7.1     6.4
1988     4.9     6.6     5.7     6.1     6.0     4.8     4.7     5.7     5.8     5.0     6.8     6.8
1989     7.7     7.9     8.0     7.5     7.2     7.2     8.2     7.2     5.2     7.9     6.9    -999
1990     7.4     7.2     7.4     6.7     5.5     6.0     8.2     5.7     5.1     7.5     1.4     6.6
1991     8.5     6.0     7.3     5.1     6.3     5.8     5.9     5.9     6.2     6.1     5.7     7.6
1992     7.6     7.0     8.0     8.0     6.6     6.5     7.4     7.6     6.8     7.2     7.2     6.9
1993     6.5     7.3     7.9     6.4     5.5     4.8     6.6     7.0     7.5     6.7     8.1     7.4
1994     6.1     7.5     7.8     8.2     7.5     5.9     7.2     6.6     5.8     7.3     6.7     6.5
1995     7.3     7.9     6.6     7.2     6.6     5.7     5.1     5.1     6.5     7.5     6.7     6.1
1996     6.3     6.8     7.8     8.1    -999    -999     5.4     5.7     6.1     6.9     5.7     5.4
1997     5.4     7.2     6.8     8.4     5.0     5.0     5.1     7.4     3.5     7.5     4.7     6.0
1998     8.6     7.6     8.8     8.3     6.5     5.7     6.5     4.1     7.6     7.2     6.3     6.9
1999     7.2     6.6     6.9     7.9     7.3     7.2    -999    -999    -999    -999    -999    -999