1975 10 99.99 -99.99  26.90 
1975 11 99.99 -99.99  26.90 
1975 12 99.99 -99.99  26.90 
1976 01 99.99 -99.99  27.10 
1976 02 99.99 -99.99  26.80 
1976 03 99.99 -99.99  26.90 
1976 04 99.99 -99.99  27.20 
1976 05 99.99 -99.99  26.70 
1976 06 99.99 -99.99  26.70 
1976 07 99.99 -99.99  26.30 
1976 08 99.99 -99.99  26.20 
1976 09 99.99 -99.99  26.70 
1976 10 99.99 -99.99  27.10 
1976 11 99.99 -99.99  27.70 
1976 12 99.99 -99.99  27.60 
1977 01 99.99 -99.99  27.40 
1977 02 99.99 -99.99  27.60 
1977 03 99.99 -99.99  27.70 
1977 04 99.99 -99.99  27.20 
1977 05 99.99 -99.99  27.20 
1977 06 99.99 -99.99  27.00 
1977 07 99.99 -99.99  26.80 
1977 08 99.99 -99.99  26.40 
1977 09 99.99 -99.99  26.30 
1977 10 99.99 -99.99  26.80 
1977 11 99.99 -99.99  27.10 
1977 12 99.99 -99.99  27.70 
1978 01 99.99 -99.99  27.40 
1978 02 99.99 -99.99  27.50 
1978 03 99.99 -99.99  27.40 
1978 04 99.99 -99.99  27.30 
1978 05 99.99 -99.99  27.50 
1978 06 99.99 -99.99  27.00 
1978 07 99.99 -99.99  27.10 
1978 08 99.99 -99.99  26.90 
1978 09 99.99 -99.99  26.70 
1978 10 99.99 -99.99  26.90 
1978 11 99.99 -99.99  27.20 
1978 12 99.99 -99.99  27.70 
1979 01 99.99 -99.99  28.00 
1979 02 99.99 -99.99  27.50 
1979 03 99.99 -99.99  27.50 
1979 04 99.99 -99.99  27.20 
1979 05 99.99 -99.99  26.80 
1979 06 99.99 -99.99  26.50 
1979 07 99.99 -99.99  26.20 
1979 08 99.99 -99.99  26.20 
1979 09 99.99 -99.99  26.50 
1979 10 99.99 -99.99  27.00 
1979 11 99.99 -99.99  27.20 
1979 12 99.99 -99.99  27.40 
1980 01 99.99 -99.99  27.80 
1980 02 99.99 -99.99  27.60 
1980 03 99.99 -99.99  27.40 
1980 04 99.99 -99.99  27.50 
1980 05 99.99 -99.99  27.10 
1980 07 99.99 -99.99  26.20 
1980 08 99.99 -99.99  26.10 
1980 09 99.99 -99.99  26.40 
1980 10 99.99 -99.99  26.90 
1980 11 99.99 -99.99  27.80 
1980 12 99.99 -99.99  28.00 
1981 01 99.99 -99.99  27.90 
1981 02 99.99 -99.99  27.40 
1981 03 99.99 -99.99  27.70 
1981 04 99.99 -99.99  28.00 
1981 05 99.99 -99.99  27.50 
1981 06 99.99 -99.99  27.10 
1981 07 99.99 -99.99  26.80 
1981 08 99.99 -99.99  27.00 
1981 09 99.99 -99.99  26.90 
1981 10 99.99 -99.99  27.20 
1981 11 99.99 -99.99  27.90 
1982 01 99.99 -99.99  28.10 
1982 03 99.99 -99.99  28.00 
1982 04 99.99 -99.99  27.60 
1982 05 99.99 -99.99  27.60 
1982 06 99.99 -99.99  27.40 
1982 07 99.99 -99.99  26.50 
1982 08 99.99 -99.99  26.90 
1982 09 99.99 -99.99  27.10 
1982 11 99.99 -99.99  25.50 
1982 12 99.99 -99.99  26.30 
1983 01 99.99 -99.99  27.00 
1983 02 99.99 -99.99  26.80 
1983 03 99.99 -99.99  27.00 
1983 04 99.99 -99.99  27.20 
1983 05 99.99 -99.99  27.30 
1983 06 99.99 -99.99  27.00 
1983 07 99.99 -99.99  26.40 
1983 08 99.99 -99.99  26.30 
1983 09 99.99 -99.99  26.60 
1983 10 99.99 -99.99  27.20 
1983 11 99.99 -99.99  27.80 
1983 12 99.99 -99.99  28.20 
1984 01 99.99 -99.99  28.00 
1984 02 99.99 -99.99  27.30 
1984 03 99.99 -99.99  26.90 
1984 04 99.99 -99.99  27.40 
1984 05 99.99 -99.99  27.30 
1984 06 99.99 -99.99  27.10 
1984 07 99.99 -99.99  26.10 
1984 08 99.99 -99.99  26.70 
1984 09 99.99 -99.99  27.00 
1984 10 99.99 -99.99  27.60 
1984 11 99.99 -99.99  27.70 
1985 01 99.99 -99.99  27.80 
1985 02 99.99 -99.99  28.00 
1985 03 99.99 -99.99  27.70 
1985 04 99.99 -99.99  27.50 
1985 05 99.99 -99.99  27.80 
1985 06 99.99 -99.99  27.40 
1985 07 99.99 -99.99  27.10 
1985 08 99.99 -99.99  26.90 
1985 09 99.99 -99.99  27.10 
1985 10 99.99 -99.99  27.40 
1985 11 99.99 -99.99  28.20 
1985 12 99.99 -99.99  28.40 
1986 01 99.99 -99.99  28.30 
1986 02 99.99 -99.99  27.80 
1986 04 99.99 -99.99  27.70 
1986 05 99.99 -99.99  28.10 
1986 06 99.99 -99.99  27.30 
1986 07 99.99 -99.99  26.80 
1986 08 99.99 -99.99  27.10 
1986 09 99.99 -99.99  26.90 
1986 10 99.99 -99.99  27.10 
1986 11 99.99 -99.99  27.90 
