1970 01 26.70  16.90  21.80 
1970 02 30.30  16.00  23.15 
1970 03 34.80  19.10  26.95 
1970 04 36.30  21.90  29.09 
1970 05 34.59  20.80  27.70 
1970 06 32.59  20.90  26.75 
1970 07 29.50  20.29  24.90 
1970 08 29.60  20.10  24.85 
1970 09 28.90  19.90  24.40 
1970 10 29.50  19.70  24.60 
1970 11 27.90  15.80  21.85 
1970 12 31.10  16.70  23.90 
1971 01 31.70  16.50  24.10 
1971 02 33.09  17.00  25.05 
1971 03 34.70  18.40  26.55 
1971 04 34.59  18.60  26.59 
1971 05 35.70  21.60  28.65 
1971 06 32.09  20.50  26.30 
1971 07 30.90  19.90  25.40 
1971 08 29.60  19.70  24.65 
1971 09 30.20  20.00  25.10 
1971 10 30.20  19.70  24.95 
1971 11 30.00  18.40  24.20 
1971 12 31.40  18.50  24.95 
1972 01 32.20  17.50  24.85 
1972 02 32.50  16.79  24.65 
1972 03 35.30  20.20  27.75 
1972 04 35.90  21.70  28.80 
1972 05 34.30  21.70  28.00 
1972 06 31.00  21.10  26.05 
1972 07 31.70  20.60  26.15 
1972 08 30.70  19.60  25.15 
1972 09 31.20  19.60  25.40 
1972 10 31.70  19.50  25.60 
1972 11 31.50  19.20  25.35 
1972 12 30.60  16.50  23.55 
1973 01 30.60  15.70  23.15 
1973 02 32.09  15.90  24.00 
1973 03 36.50  19.60  28.05 
1973 04 34.70  21.00  27.85 
1973 05 34.50  21.60  28.05 
1973 06 31.40  20.20  25.80 
1973 07 30.50  19.00  24.75 
1973 10 28.50  19.20  23.85 
1973 11 30.30  18.10  24.20 
1973 12 28.50  14.40  21.45 
1974 01 31.60  17.40  24.50 
1974 02 30.80  16.00  23.40 
1974 03 33.59  19.00  26.30 
1974 04 34.30  19.90  27.09 
1974 05 34.30  20.70  27.50 
1974 06 29.80  19.90  24.84 
1974 07 29.80  19.29  24.55 
1974 08 31.50  19.40  25.45 
1974 09 29.10  19.29  24.20 
1974 10 29.30  17.60  23.45 
1974 11 30.10  17.40  23.75 
1974 12 30.50  16.50  23.50 
1975 01 30.20  16.00  23.10 
1975 02 33.00  17.00  25.00 
1975 03 34.90  19.70  27.30 
1975 04 36.30  21.40  28.84 
1975 05 34.59  21.50  28.05 
1975 06 31.80  20.00  25.90 
1975 07 31.40  19.00  25.20 
1975 08 31.20  19.29  25.25 
1975 09 29.50  18.90  24.20 
1975 10 29.10  18.70  23.90 
1975 11 29.20  17.10  23.15 
1975 12 29.50  15.30  22.40 
1976 01 28.70  14.40  21.55 
1976 02 30.40  15.30  22.85 
1976 03 35.00  19.79  27.40 
1976 04 35.00  19.90  27.45 
1976 05 34.50  20.80  27.65 
1976 06 30.50  20.10  25.30 
1976 07 30.90  19.40  25.15 
1976 08 31.20  19.50  25.35 
1976 09 31.80  19.60  25.70 
1976 10 30.40  18.79  24.59 
1976 11 28.60  16.79  22.70 
1976 12 27.90  15.00  21.45 
1977 01 30.40  15.00  22.70 
1977 02 30.60  15.90  23.25 
1977 03 35.00  18.10  26.55 
1977 04 34.00  19.20  26.60 
1977 05 34.00  20.70  27.35 
1977 06 31.10  20.00  25.55 
1977 07 32.20  19.60  25.90 
1977 08 31.50  19.29  25.40 
1977 09 30.90  19.79  25.34 
1977 10 30.60  19.10  24.85 
1977 11 31.10  18.40  24.75 
1977 12 31.50  17.70  24.60 
1978 01 30.70  15.70  23.20 
1978 02 31.80  16.40  24.09 
1978 03 33.20  18.20  25.70 
1978 04 35.00  20.80  27.90 
1978 05 35.09  21.30  28.20 
1978 06 31.20  19.50  25.35 
1978 07 30.40  19.70  25.05 
1978 08 31.40  19.90  25.65 
1978 09 30.20  19.50  24.85 
1978 10 29.90  18.50  24.20 
1978 11 32.00  18.40  25.20 
1978 12 32.09  17.29  24.70 
1979 01 31.50  15.60  23.55 
1979 02 32.09  16.20  24.15 
1979 03 34.70  18.90  26.80 
1979 04 35.59  20.29  27.95 
1979 05 35.09  21.10  28.09 
1979 06 31.00  20.10  25.55 
1979 07 31.50  20.10  25.80 
1979 08 30.20  19.60  24.90 
1979 09 27.90  19.40  23.65 
1979 10 29.70  19.00  24.35 
1979 11 29.00  17.20  23.10 
1979 12 28.70  15.60  22.15 
1980 01 32.80  16.20  24.50 
1980 02 33.00  15.90  24.45 
1980 03 37.20  18.79  28.00 
1980 04 35.20  19.29  27.25 
1980 05 37.70  21.90  29.80 
1980 06 32.20  20.50  26.35 
1980 07 32.90  19.70  26.30 
