1973 07 13.39   8.85  11.12 
1973 08 18.95  11.78  15.36 
1973 10  6.00  -1.19   2.40 
1974 01 11.70 -17.67 -14.68 
1974 02 12.42 -20.62 -16.52 
1975 03 -4.04 -11.19  -7.61 
1975 04  1.69  -4.58  -1.44 
1979 09 12.23   6.31   9.26 
1980 02 14.13 -22.52 -18.32 
1980 08 17.31  10.27  13.79 
1980 09 12.08   6.08   9.08 
1980 10  4.92  -1.25   1.83 
1981 03 -9.27 -17.50 -13.38 
1981 07 17.74  10.67  14.20 
1982 07 15.35  12.06  13.70 
1984 01 12.72 -19.79 -16.25 
1985 12 15.47 -21.24 -18.35 
1986 01 17.54 -25.51 -21.52 
1986 03 -6.55 -14.55 -10.55 
1986 04  1.43  -4.11  -1.34 
1987 10  5.75  -1.30   2.22 
1987 12 15.25 -22.67 -18.95 
1988 12 -9.87 -15.89 -12.88 
1989 02 -9.74 -17.43 -13.58 
1993 12 12.20 -20.62 -16.41 
