1988 01 -8.88 -17.79 -13.34 
1988 02 17.15 -25.71 -21.43 
1988 03 29.00 -35.41 -32.20 
1988 04 27.12 -36.59 -31.86 
1988 05 34.25 -40.66 -37.46 
1988 06 33.18 -39.57 -36.37 
1988 07 32.72 -40.54 -36.63 
1988 08 31.19 -38.82 -35.00 
1988 09 29.22 -37.14 -33.18 
1988 10 21.14 -30.23 -25.68 
1988 11 15.87 -25.06 -20.46 
1988 12 -9.64 -18.45 -14.04 
1989 01 -8.17 -17.62 -12.89 
1989 02 19.32 -27.40 -23.36 
1989 03 25.85 -32.72 -29.28 
1989 04 28.77 -35.03 -31.90 
1989 05 36.08 -41.02 -38.55 
1989 06 38.66 -44.70 -41.68 
1989 07 33.30 -39.91 -36.60 
1989 08 37.33 -43.07 -40.20 
1989 09 29.78 -36.91 -33.34 
1989 10 26.39 -34.34 -30.37 
1989 11 15.52 -24.82 -20.17 
1989 12 -7.16 -16.23 -11.69 
1990 01 -9.29 -18.09 -13.69 
1990 02 17.56 -26.74 -22.15 
1990 03 26.37 -34.08 -30.22 
1990 04 34.93 -40.18 -37.56 
1990 05 33.29 -39.13 -36.21 
1990 06 34.73 -41.87 -38.30 
1990 10 26.11 -34.66 -30.39 
1990 11 15.06 -23.50 -19.28 
1990 12 -6.67 -15.93 -11.30 
1991 01 -9.37 -18.39 -13.87 
1991 02 14.56 -22.69 -18.62 
1991 03 27.72 -34.74 -31.23 
1991 05 33.22 -39.87 -36.54 
1992 04 35.09 -39.91 -37.50 
1992 05 32.43 -38.50 -35.47 
1992 06 32.83 -39.30 -36.06 
1992 08 28.42 -35.37 -31.89 
1992 09 35.74 -43.13 -39.43 
