1970 01 99.99 -99.99  13.60 
1970 02 99.99 -99.99  15.50 
1970 03 99.99 -99.99  22.40 
1970 04 99.99 -99.99  28.90 
1970 05 99.99 -99.99  33.70 
1970 06 99.99 -99.99  36.09 
1970 07 99.99 -99.99  33.90 
1970 08 99.99 -99.99  33.90 
1970 09 99.99 -99.99  30.80 
1970 10 99.99 -99.99  26.90 
1970 11 99.99 -99.99  19.79 
1971 01 99.99 -99.99  12.10 
1971 02 99.99 -99.99  16.20 
1971 03 99.99 -99.99  21.50 
1971 04 99.99 -99.99  29.30 
1971 05 99.99 -99.99  32.80 
1971 06 99.99 -99.99  35.00 
1971 07 99.99 -99.99  33.40 
1971 08 99.99 -99.99  32.59 
1971 09 99.99 -99.99  29.90 
1971 10 99.99 -99.99  25.80 
1971 11 99.99 -99.99  21.00 
1971 12 99.99 -99.99  15.70 
1972 01 99.99 -99.99  13.10 
1972 02 99.99 -99.99  12.70 
1972 03 99.99 -99.99  21.70 
1972 04 99.99 -99.99  26.30 
1972 05 99.99 -99.99  31.50 
1972 06 99.99 -99.99  35.09 
1972 07 99.99 -99.99  32.70 
1972 08 99.99 -99.99  31.60 
1972 09 99.99 -99.99  29.50 
1972 10 99.99 -99.99  25.00 
1972 11 99.99 -99.99  19.79 
1972 12 99.99 -99.99  15.00 
1973 01 99.99 -99.99  12.30 
1973 02 99.99 -99.99  16.00 
1973 03 99.99 -99.99  20.50 
1973 04 99.99 -99.99  28.80 
1973 05 99.99 -99.99  32.30 
1973 06 99.99 -99.99  35.09 
1973 07 99.99 -99.99  32.70 
1973 08 99.99 -99.99  31.00 
1973 09 99.99 -99.99  30.20 
1973 12 99.99 -99.99  13.60 
1974 01 99.99 -99.99  12.30 
1974 02 99.99 -99.99  13.50 
1974 03 99.99 -99.99  23.00 
1974 04 99.99 -99.99  28.80 
1974 05 99.99 -99.99  32.90 
1974 06 99.99 -99.99  33.09 
1974 07 99.99 -99.99  33.30 
1974 08 99.99 -99.99  32.80 
1974 09 99.99 -99.99  30.60 
1974 10 99.99 -99.99  24.50 
1974 11 99.99 -99.99  19.29 
1974 12 99.99 -99.99  13.80 
1975 01 99.99 -99.99  12.80 
1975 02 99.99 -99.99  14.60 
1975 03 99.99 -99.99  20.90 
1975 04 99.99 -99.99  27.60 
1975 05 99.99 -99.99  32.30 
1975 06 99.99 -99.99  34.20 
1975 07 99.99 -99.99  32.90 
1975 08 99.99 -99.99  31.60 
1975 09 99.99 -99.99  30.30 
1975 10 99.99 -99.99  26.20 
1975 11 99.99 -99.99  19.10 
1975 12 99.99 -99.99  15.10 
1976 07 99.99 -99.99  34.90 
1977 04 99.99 -99.99  26.30 
