1966 08 99.99 -99.99  25.80 
1966 09 99.99 -99.99  26.90 
1966 10 99.99 -99.99  28.90 
1966 11 99.99 -99.99  28.90 
1966 12 99.99 -99.99  26.20 
1967 01 99.99 -99.99  25.20 
1967 02 99.99 -99.99  26.10 
1967 03 99.99 -99.99  28.20 
1967 04 99.99 -99.99  31.10 
1967 05 99.99 -99.99  32.20 
1967 06 99.99 -99.99  28.70 
1967 07 99.99 -99.99  26.10 
1967 08 99.99 -99.99  24.80 
1967 09 99.99 -99.99  26.30 
1967 10 99.99 -99.99  27.10 
1967 11 99.99 -99.99  26.10 
1967 12 99.99 -99.99  25.70 
1968 01 99.99 -99.99  24.80 
1968 02 99.99 -99.99  24.30 
1968 03 99.99 -99.99  28.50 
1968 04 99.99 -99.99  29.80 
1968 05 99.99 -99.99  31.70 
1968 06 99.99 -99.99  27.70 
1968 07 99.99 -99.99  25.60 
1968 08 99.99 -99.99  26.70 
1968 09 99.99 -99.99  27.30 
1968 10 99.99 -99.99  29.20 
1968 11 99.99 -99.99  29.30 
1968 12 99.99 -99.99  26.50 
1969 01 99.99 -99.99  24.40 
1969 02 99.99 -99.99  27.10 
1969 03 99.99 -99.99  32.00 
1969 04 99.99 -99.99  32.00 
1969 05 99.99 -99.99  32.09 
1969 06 99.99 -99.99  30.30 
1969 07 99.99 -99.99  27.20 
1969 08 99.99 -99.99  26.10 
1969 09 99.99 -99.99  27.40 
1969 10 99.99 -99.99  29.50 
1969 11 99.99 -99.99  29.30 
1969 12 99.99 -99.99  27.20 
1970 01 99.99 -99.99  24.30 
1970 02 99.99 -99.99  27.30 
1970 03 99.99 -99.99  29.30 
1970 04 99.99 -99.99  32.30 
1970 05 99.99 -99.99  31.60 
1970 06 99.99 -99.99  31.30 
1970 07 99.99 -99.99  27.20 
1970 10 99.99 -99.99  27.60 
1970 11 99.99 -99.99  28.10 
1970 12 99.99 -99.99  24.90 
1971 01 99.99 -99.99  24.50 
1971 02 99.99 -99.99  26.10 
1971 03 99.99 -99.99  30.50 
1971 04 99.99 -99.99  31.30 
1971 05 99.99 -99.99  31.90 
1971 06 99.99 -99.99  29.90 
1971 07 99.99 -99.99  26.20 
1971 08 99.99 -99.99  26.20 
1971 09 99.99 -99.99  25.70 
1971 10 99.99 -99.99  28.30 
1971 11 99.99 -99.99  28.20 
1971 12 99.99 -99.99  23.10 
1972 01 99.99 -99.99  25.70 
1972 02 99.99 -99.99  25.70 
1972 03 99.99 -99.99  29.40 
1972 04 99.99 -99.99  32.30 
1972 05 99.99 -99.99  32.00 
1972 06 99.99 -99.99  28.50 
1972 07 99.99 -99.99  26.50 
1972 08 99.99 -99.99  26.30 
1972 09 99.99 -99.99  27.10 
1972 10 99.99 -99.99  29.60 
1972 11 99.99 -99.99  28.60 
1972 12 99.99 -99.99  25.10 
1973 01 99.99 -99.99  25.10 
1973 02 99.99 -99.99  29.10 
1973 03 99.99 -99.99  30.10 
1973 04 99.99 -99.99  33.80 
1973 05 99.99 -99.99  31.30 
1973 06 99.99 -99.99  30.70 
1973 07 99.99 -99.99  27.50 
1973 08 99.99 -99.99  26.30 
1973 09 99.99 -99.99  26.40 
1973 10 99.99 -99.99  27.60 
1973 11 99.99 -99.99  28.80 
1973 12 99.99 -99.99  26.90 
1974 01 99.99 -99.99  24.70 
1974 02 99.99 -99.99  27.70 
1974 03 99.99 -99.99  29.30 
1974 04 99.99 -99.99  33.50 
1974 05 99.99 -99.99  31.60 
1974 06 99.99 -99.99  28.70 
1974 07 99.99 -99.99  25.40 
1974 08 99.99 -99.99  25.50 
1974 09 99.99 -99.99  26.40 
1974 10 99.99 -99.99  29.50 
1974 11 99.99 -99.99  28.90 
1974 12 99.99 -99.99  26.00 
1975 01 99.99 -99.99  25.50 
1975 02 99.99 -99.99  29.10 
1975 03 99.99 -99.99  31.10 
1975 04 99.99 -99.99  32.59 
1975 05 99.99 -99.99  33.30 
1975 06 99.99 -99.99  28.80 
1975 07 99.99 -99.99  26.80 
1975 08 99.99 -99.99  24.70 
1975 09 99.99 -99.99  25.70 
1975 10 99.99 -99.99  28.40 
1975 11 99.99 -99.99  29.50 
1975 12 99.99 -99.99  26.40 
1987 01 99.99 -99.99  24.50 
1987 02 99.99 -99.99  27.60 
1987 04 99.99 -99.99  31.90 
1987 05 99.99 -99.99  29.70 
1987 06 99.99 -99.99  28.00 
1987 08 99.99 -99.99  25.80 
1987 09 99.99 -99.99  28.30 
1987 10 99.99 -99.99  28.50 
1987 11 99.99 -99.99  29.10 
1988 01 99.99 -99.99  24.20 
1988 03 99.99 -99.99  29.90 
1988 04 99.99 -99.99  31.70 
1988 05 99.99 -99.99  32.50 
1988 06 99.99 -99.99  28.50 
1988 07 99.99 -99.99  25.50 
1988 08 99.99 -99.99  25.30 
1988 09 99.99 -99.99  25.50 
1988 10 99.99 -99.99  25.50 
1988 11 99.99 -99.99  27.40 
1988 12 99.99 -99.99  26.10 
1989 01 99.99 -99.99  21.30 
1989 02 99.99 -99.99  23.00 
1989 05 99.99 -99.99  30.00 
1989 07 99.99 -99.99  26.50 
1989 08 99.99 -99.99  25.50 
1989 09 99.99 -99.99  26.40 
1989 11 99.99 -99.99  28.00 
1990 01 99.99 -99.99  24.20 
1990 02 99.99 -99.99  23.90 
1990 03 99.99 -99.99  27.30 
1990 04 99.99 -99.99  33.30 
1990 05 99.99 -99.99  30.70 
1990 08 99.99 -99.99  27.30 
1990 09 99.99 -99.99  27.10 
1990 10 99.99 -99.99  29.00 
1991 03 99.99 -99.99  28.60 
1991 09 99.99 -99.99  28.00 
1991 10 99.99 -99.99  28.00 
1991 12 99.99 -99.99  26.30 
