1981 02 30.90  23.50  27.20 
1981 03 32.20  21.60  26.90 
1981 04 34.20  23.40  28.80 
1981 05 35.00  23.80  29.40 
1981 06 31.60  23.30  27.45 
1981 07 31.50  23.10  27.30 
1981 08 30.30  23.10  26.70 
1981 09 31.90  23.40  27.65 
1981 10 31.50  22.90  27.20 
1981 11 31.00  22.00  26.50 
1981 12 30.20  20.80  25.50 
1982 01 29.20  19.50  24.35 
1982 02 29.90  20.20  25.05 
1982 03 31.80  21.00  26.40 
1982 04 34.20  22.80  28.50 
1982 05 35.59  23.60  29.59 
1982 06 34.00  23.40  28.70 
1982 07 30.90  23.00  26.95 
1982 08 30.90  22.80  26.84 
1982 09 31.60  22.40  27.00 
1982 10 32.59  22.10  27.34 
1982 11 32.90  21.90  27.40 
1982 12 31.70  21.50  26.60 
1983 01 30.90  20.90  25.90 
1983 02 31.20  19.60  25.40 
1983 03 32.09  21.30  26.70 
1983 04 32.80  22.80  27.80 
1983 05 35.70  24.00  29.85 
1983 06 35.20  24.30  29.75 
1983 07 33.59  23.50  28.55 
1983 08 31.60  23.20  27.40 
1983 09 32.20  23.50  27.85 
1983 10 31.00  23.30  27.15 
1983 11 30.50  22.10  26.30 
1983 12 29.90  20.80  25.34 
1984 01 30.60  21.00  25.80 
1984 02 30.90  20.80  25.84 
1984 03 32.90  22.30  27.60 
1984 04 32.90  22.70  27.80 
1984 05 33.30  23.60  28.45 
1984 06 31.50  23.40  27.45 
1984 07 32.00  23.60  27.80 
1984 08 29.20  23.10  26.15 
1984 09 31.80  22.80  27.30 
1984 10 30.30  22.70  26.50 
1984 12 31.40  21.20  26.30 
1985 01 30.20  20.20  25.20 
1985 02 31.70  22.10  26.90 
1985 03 32.09  22.50  27.30 
1985 04 33.09  23.20  28.15 
1985 05 35.20  24.00  29.60 
1985 06 31.10  23.40  27.25 
1985 07 31.70  23.70  27.70 
1985 08 30.60  23.80  27.20 
1985 09 31.00  23.10  27.05 
1985 10 30.60  22.60  26.60 
1985 11 31.60  22.50  27.05 
1985 12 30.60  21.00  25.80 
1986 01 29.20  20.70  24.95 
1986 02 30.00  20.70  25.35 
1986 03 31.10  21.60  26.35 
1986 04 32.09  23.00  27.55 
1986 05 32.90  23.80  28.35 
1986 06 32.70  23.50  28.10 
1986 07 31.00  23.20  27.10 
1986 08 30.10  23.10  26.60 
1986 09 30.70  22.70  26.70 
1986 10 30.70  22.40  26.55 
1986 11 31.80  22.50  27.15 
1986 12 31.20  20.60  25.90 
1987 01 29.70  19.90  24.80 
1987 02 29.80  19.79  24.80 
1987 03 31.30  21.30  26.30 
1987 04 33.09  23.30  28.20 
1987 05 35.59  23.80  29.70 
1987 06 34.59  24.00  29.30 
1987 07 32.50  23.70  28.10 
1987 08 32.70  23.50  28.10 
1987 09 31.90  23.50  27.70 
1987 10 32.80  23.30  28.05 
1987 11 32.59  22.80  27.70 
1987 12 31.20  21.80  26.50 
1988 01 31.80  21.60  26.70 
1988 02 32.20  21.80  27.00 
1988 03 32.30  22.00  27.15 
1988 04 34.20  23.50  28.85 
1988 05 35.59  24.60  30.09 
1988 06 33.09  23.70  28.40 
1988 07 32.80  23.60  28.20 
1988 08 32.90  23.50  28.20 
1988 09 32.80  23.40  28.09 
1988 10 30.90  22.90  26.90 
1988 11 31.70  22.00  26.85 
1988 12 29.90  20.10  25.00 
1989 01 30.50  21.10  25.80 
1989 02 30.70  20.70  25.70 
1989 03 31.30  21.40  26.34 
1989 04 34.80  23.10  28.95 
1989 05 34.40  24.10  29.25 
1989 06 33.50  23.70  28.60 
1989 07 32.40  23.70  28.05 
1989 08 31.40  23.70  27.55 
1989 09 32.09  23.30  27.70 
1989 10 33.00  23.20  28.10 
1989 11 32.40  21.30  26.85 
1989 12 31.30  19.60  25.45 
1990 01 32.00  19.90  25.95 
1990 02 33.00  20.10  26.55 
1990 03 33.59  21.60  27.59 
1990 04 36.20  23.50  29.85 
1990 05 35.80  24.00  29.90 
1990 06 32.40  24.20  28.30 
1990 07 32.50  23.90  28.20 
1990 08 31.80  24.00  27.90 
1990 09 32.00  23.50  27.75 
1990 10 32.50  22.60  27.55 
1990 11 32.90  22.10  27.50 
1990 12 32.09  20.80  26.45 
