1969    -999    -999    -999    -999   -17.8   -20.3   -16.8   -17.6   -15.8   -18.3   -15.7   -14.0
1970   -12.0   -13.4   -14.6   -17.4   -16.7   -16.0   -15.7   -16.5   -14.6   -13.2   -14.0   -12.4
1971   -14.3   -14.8   -12.5   -13.7   -17.5   -15.0   -17.0   -17.7   -16.8   -15.3   -14.4   -15.8
1972   -11.9   -11.5   -12.4   -14.9   -15.1   -17.7   -17.6   -19.8   -16.2   -13.6   -14.1   -11.7
1973   -14.5   -13.5   -12.8   -16.7   -16.4   -17.8   -15.1   -16.0   -16.3   -14.0   -13.1   -14.0
1974   -12.8   -10.0   -12.0   -15.6   -15.4   -14.7   -18.7   -18.3   -18.3   -14.8   -14.0   -11.1
1975   -12.2   -11.5   -13.0   -13.4   -15.7   -17.2   -19.4   -17.8   -15.5   -14.9   -15.7   -14.6
1976   -13.6   -10.7   -14.0   -14.4   -16.9   -16.6   -21.2   -19.5   -18.5   -13.7   -14.3   -15.0
1977   -13.4   -12.6   -12.9   -13.9   -15.6   -17.8   -18.0   -18.2   -18.4   -15.9   -13.3   -12.2
1978   -11.6   -12.5   -10.8   -13.8   -11.2   -18.3   -21.0   -18.3   -15.6   -15.4   -15.2   -14.5
1979   -10.7   -11.9    -9.6   -13.3   -16.0   -17.8   -16.3   -19.3   -17.3   -16.4   -14.2   -13.2
1980   -11.3   -10.4   -13.1   -17.3   -12.6    -999   -18.9   -18.3   -17.8   -16.0   -17.1   -11.2
1981   -11.6   -11.6   -11.9   -12.6   -14.6   -16.5   -16.8   -19.7   -17.1   -15.7   -15.4   -14.1
1982    -9.6   -11.5   -12.8   -14.2   -11.1   -13.7   -20.3   -16.7   -16.6   -16.5   -14.9   -11.8
1983   -10.6   -14.4   -12.4   -11.5   -13.7   -16.7   -15.8   -15.7   -15.6   -16.2   -13.9   -13.4
1984   -13.8   -11.5   -10.7   -14.4   -16.2   -17.3   -17.3   -17.0   -15.1   -15.3   -13.5    -9.9
1985   -10.2   -11.2   -14.7   -14.8   -16.3   -14.8   -16.3   -16.6   -14.5   -14.7   -11.9   -13.0
1986   -12.3   -12.2   -12.7   -13.8   -19.3   -18.3   -17.7   -19.3   -16.7   -14.9   -15.1   -13.1
1987   -11.7   -11.0   -12.8   -14.1   -13.9   -17.7   -22.3   -14.8   -20.4   -15.7   -14.1   -11.5
1988   -12.4   -11.3   -12.2   -13.3   -12.1   -16.6   -14.9   -17.7   -14.3   -12.8   -13.1   -12.6
1989   -11.2   -10.9   -11.4   -15.9   -13.8   -13.9   -14.0   -15.0   -14.9   -15.0   -13.5   -12.7
1990   -10.3    -9.9   -11.8   -17.2   -14.2   -18.3   -16.2   -18.4   -14.5   -16.6   -15.1   -14.5
1991   -11.8   -15.0   -14.3   -13.6   -17.7   -20.9   -15.7   -17.4   -14.4   -16.2   -15.2   -13.0
1992    -9.6   -13.7   -14.1   -12.2   -18.7   -18.1   -15.7   -15.3   -14.0   -14.0    -9.7    -8.1
1993   -12.4   -10.3   -13.9   -14.0   -13.6   -16.1   -16.0   -16.8   -17.1   -14.7   -14.1   -13.5
1994   -10.1   -10.9   -12.0   -13.6   -16.1   -17.4   -22.6   -16.5   -18.9   -19.1   -11.5   -12.1
1995    -9.6   -11.2   -13.5   -13.7   -13.7   -17.4   -19.2   -18.0   -15.9   -12.0   -12.4   -10.2
1996   -11.3   -10.8   -13.1   -14.3   -14.8   -16.6   -15.3   -16.3   -14.8   -16.0   -15.3    -999
1997    -999    -999    -999    -999    -999    -999    -999    -999    -999    -999   -12.8   -14.7
1998   -10.8    -9.4   -10.6   -11.8   -13.7   -12.0   -16.6   -16.7   -17.7   -15.6   -13.4   -13.5
1999   -11.8    -999    -999    -999    -999    -999    -999    -999    -999    -999    -999    -999