1969    -999    -999    -999    -999   -31.9   -35.4   -33.5   -34.6   -32.3   -33.3   -30.1   -29.2
1970   -26.8   -28.6   -29.6   -33.0   -33.4   -32.2   -32.7   -33.5   -30.9   -29.3   -28.9   -27.8
1971   -28.9   -29.7   -27.8   -28.3   -32.6   -31.5   -33.8   -34.4   -33.5   -31.2   -30.5   -29.9
1972   -27.3   -26.7   -27.7   -29.8   -31.7   -33.2   -33.4   -34.8   -32.8   -29.3   -29.4   -26.4
1973   -28.2   -27.4   -27.8   -31.0   -31.8   -35.0   -31.1   -32.9   -33.3   -29.5   -30.1   -29.7
1974   -27.5   -23.7   -27.2   -30.0   -30.9   -31.9   -33.9   -34.7   -32.8   -30.2   -29.0   -26.5
1975   -25.4   -26.4   -27.0   -27.7   -31.3   -32.0   -34.5   -33.4   -32.3   -30.2   -31.1   -27.8
1976   -28.1   -25.7   -28.1   -29.6   -32.5   -33.5   -37.0   -35.4   -34.3   -29.9   -30.5   -30.7
1977   -29.0   -27.8   -28.5   -30.7   -31.6   -34.2   -34.2   -34.8   -34.8   -31.9   -29.8   -27.4
1978   -26.9   -27.9   -25.9   -30.1   -27.3   -34.6   -36.3   -33.9   -31.7   -31.6   -30.0   -30.3
1979   -25.5   -27.7   -25.2   -28.6   -32.4   -34.3   -33.2   -36.3   -34.0   -33.2   -30.8   -29.0
1980   -28.1   -26.7   -28.7   -32.0   -28.3    -999   -35.8   -34.2   -33.8   -32.7   -32.6   -26.5
1981   -26.5   -28.0   -27.0   -28.1   -31.7   -33.7   -33.9   -36.1   -33.0   -31.9   -32.3   -29.0
1982   -25.3   -27.0   -28.4   -29.4   -27.3   -30.4   -35.8   -34.2   -33.3   -33.3   -29.2   -27.3
1983   -25.5   -28.3   -27.2   -27.4   -29.1   -32.9   -32.7   -31.6   -33.4   -32.9   -31.1   -29.0
1984   -27.9   -27.0   -26.3   -30.5   -30.4   -33.7   -32.3   -33.8   -31.6   -31.2   -28.9   -25.6
1985   -25.6   -26.0   -31.2   -30.8   -32.2   -30.9   -32.6   -33.2   -31.5   -31.1   -28.1   -28.0
1986   -27.4   -27.0   -28.2   -30.0   -34.2   -35.6   -34.0   -34.9   -32.9   -31.3   -30.4   -27.7
1987   -26.5   -25.1   -28.1   -29.2   -29.2   -33.1   -37.0   -31.6   -35.9   -31.3   -30.0   -26.9
1988   -26.9   -26.3   -26.8   -27.5   -28.2   -33.6   -31.7   -33.4   -31.2   -29.3   -29.1   -27.6
1989   -26.1   -25.9   -27.2   -30.3   -30.3   -30.5   -31.1   -31.6   -32.2   -32.2   -29.8   -28.3
1990   -26.3   -25.3   -27.3   -32.2   -30.4   -33.5   -33.2   -35.0   -31.6   -33.6   -31.2   -29.4
1991   -26.8   -28.0   -29.7   -28.9   -33.0   -35.3   -31.5   -33.3   -30.9   -31.2   -31.3   -28.5
1992   -25.7   -28.2   -28.9   -28.7   -33.7   -32.5   -29.2   -29.9   -28.4   -29.2   -22.9   -22.5
1993   -28.4   -25.7   -29.2   -30.2   -29.3   -31.4   -33.0   -33.4   -33.0   -30.8   -30.3   -29.2
1994   -25.2   -26.3   -27.1   -29.8   -31.5   -33.6   -36.9   -32.9   -35.8   -34.0   -27.8   -27.6
1995   -24.5   -26.7   -27.0   -29.0   -26.8   -30.7   -34.0   -30.9   -29.7   -24.9   -25.8   -22.9
1996   -26.0   -25.9   -28.7   -29.9   -30.9   -32.6   -30.7   -32.4   -30.8   -31.3   -31.1    -999
1997    -999    -999    -999    -999    -999    -999    -999    -999    -999    -999   -29.8   -29.7
1998   -26.0   -23.9   -25.7   -27.7   -29.1   -28.7   -34.7   -33.5   -34.0   -32.8   -29.1   -28.5
1999   -26.6    -999    -999    -999    -999    -999    -999    -999    -999    -999    -999    -999