1969    -999    -999    -999    -999   -58.0   -61.7   -64.8   -66.7   -68.0   -62.1   -60.5   -50.8
1970   -48.7   -45.5   -50.6   -52.1   -56.2   -61.1   -67.4   -69.8   -66.9   -64.4   -52.2   -48.9
1971   -45.8   -45.6   -49.7   -52.0   -61.3   -61.6   -66.8   -65.9   -66.5   -64.0   -55.2   -49.4
1972   -49.1   -48.3   -50.5   -53.0   -60.6   -64.8   -68.0   -65.7   -64.2   -62.9   -50.9   -49.4
1973   -46.0   -44.8   -49.0   -53.6   -60.2   -63.9   -66.4   -68.0   -68.2   -59.1   -55.9   -44.9
1974   -46.2   -49.1   -49.8   -53.8   -60.1   -65.8   -67.9   -71.0   -66.8   -62.4   -58.2   -50.2
1975   -46.8   -44.3   -48.2   -53.0   -58.7   -62.0   -65.8   -70.0   -69.2   -57.5   -56.9   -48.7
1976   -46.8   -45.1   -48.6   -51.4   -55.8   -65.4   -65.0   -67.4   -68.7   -65.9   -55.6   -49.8
1977   -45.6   -46.0   -49.2   -54.2   -57.7   -64.8   -65.4   -69.1   -69.6   -66.8   -53.9   -49.7
1978   -45.7   -45.9   -48.5   -49.7   -61.8   -63.1   -66.2   -67.8   -65.9   -61.4   -52.3   -48.3
1979   -46.3   -45.0   -50.7   -53.2   -59.0   -63.1   -67.6   -70.3   -70.8   -65.3   -57.2   -48.1
1980   -45.2   -45.5   -49.4   -52.0   -56.2    -999   -65.9   -69.1   -69.3   -65.2   -60.2   -47.3
1981   -44.4   -43.8   -50.3   -55.2   -57.1   -62.9   -68.1   -67.7   -71.1   -66.5   -58.9   -49.1
1982   -46.7   -44.0   -47.0   -52.0   -58.3   -66.8   -64.8   -70.1   -69.1   -63.5   -56.5   -52.1
1983   -46.8   -45.2   -48.4   -57.2   -60.6   -64.6   -67.2   -68.7   -68.4   -64.1   -53.4   -48.9
1984   -46.0   -47.1   -52.7   -53.3   -60.8   -62.7   -66.2   -67.0   -68.1   -66.6   -53.5   -49.3
1985   -47.5   -45.7   -48.0   -51.0   -58.3   -63.6   -64.4   -66.4   -67.7   -62.1   -57.2   -47.5
1986   -46.1   -46.0   -50.1   -54.0   -57.5   -63.0   -65.7   -65.6   -66.8   -60.7   -55.3   -45.9
1987   -45.9   -47.0   -47.3   -52.8   -57.5   -64.3   -64.8   -68.1   -69.0   -65.1   -59.0   -52.1
1988   -45.2   -46.6   -47.1   -54.4   -58.4   -63.1   -65.9   -68.4   -66.4   -65.3   -49.6   -44.6
1989   -44.1   -45.0   -48.2   -52.8   -56.4   -60.6   -62.0   -66.3   -67.9   -64.9   -51.0   -53.3
1990   -45.8   -45.2   -47.3   -50.3   -60.7   -62.7   -65.7   -65.7   -68.2   -61.1   -58.4   -55.6
1991   -45.8   -43.5   -49.6   -55.5   -57.0   -63.7   -67.3   -68.9   -68.1   -67.4   -53.1   -48.8
1992   -45.0   -45.5   -48.0   -53.4   -56.8   -66.3   -62.5   -65.7   -64.7   -61.4   -55.3   -53.4
1993   -48.4   -48.6   -49.5   -54.5   -58.7   -61.0   -65.6   -66.6   -65.6   -65.8   -60.9   -48.2
1994   -47.4   -46.8   -49.7   -56.3   -60.4   -63.4   -65.2   -68.0   -69.4   -66.7   -63.8   -45.3
1995   -48.3   -47.8   -50.4   -54.5   -56.3   -59.2   -65.9   -63.7   -64.1   -57.7   -56.2   -50.9
1996   -48.1   -49.3   -49.8   -55.6   -58.0   -61.9   -64.1   -65.9   -66.8   -59.6   -59.7    -999
1997    -999    -999    -999    -999    -999    -999    -999    -999    -999    -999   -57.1   -50.0
1998   -46.6   -48.7   -51.7   -56.3   -62.4   -66.2   -67.3   -70.3   -68.8   -64.5   -55.6   -52.7
1999   -48.3    -999    -999    -999    -999    -999    -999    -999    -999    -999    -999    -999