1968 01 -4.54 -12.40  -8.46 
1968 02 -4.08 -12.28  -8.18 
1968 03  5.44  -4.78    .32 
1968 05 15.14 -99.99 -99.99 
1968 06 22.56  10.63  16.59 
1968 07 25.82  12.80  19.31 
1968 08 25.93  12.71  19.32 
1968 09 21.87  11.32  16.59 
1968 10 15.06   5.13  10.09 
1968 11  5.65   -.83   2.41 
1968 12 -1.10  -8.14  -4.62 
1969 02 -1.32  -9.80  -5.56 
1969 03  1.87  -7.09  -2.61 
1969 04 12.23    .92   6.57 
1969 05 18.42   5.22  11.82 
1969 06 22.18 -99.99 -99.99 
1969 08 27.16  14.32  20.74 
1969 10 13.08 -99.99 -99.99 
1969 12 -3.31 -99.99 -99.99 
1970 01 -6.96 -99.99 -99.99 
1970 07 26.90 -99.99 -99.99 
1970 10 13.87   6.02   9.94 
1970 11  6.86    .46   3.66 
1970 12 -1.41  -7.87  -4.64 
1971 05 18.43   4.67  11.55 
1971 06 24.62  11.85  18.23 
1971 07 25.19  12.67  18.93 
1971 08 25.27  12.40  18.83 
1971 09 22.02  11.68  16.85 
1971 10 17.79   7.81  12.80 
1971 11  6.15   -.95   2.60 
1971 12  2.32  -4.85  -1.26 
1972 01 -1.55 -10.30  -5.92 
1972 02 -2.85 -12.47  -7.66 
1972 03  -.18  -8.20  -4.19 
1972 04  7.87  -1.81   3.03 
1972 05 19.87   6.86  13.37 
1972 06 21.07  10.09  15.58 
1972 07 26.02  13.58  19.79 
1972 08 23.99  13.26  18.62 
1972 09 20.95  10.24  15.59 
1972 10 10.87   1.88   6.37 
1972 11  3.39  -2.07    .66 
1972 12   .22  -5.80  -2.79 
1973 01 -1.00  -7.79  -4.39 
1973 02 -2.56 -12.37  -7.46 
1973 03  6.97  -1.13   2.91 
1973 04 11.22   1.61   6.41 
1973 05 15.56   5.77  10.66 
1973 06 23.93  12.89  18.41 
1973 07 26.98  14.45  20.71 
1973 08 27.48  15.32  21.40 
1973 09 22.03   9.16  15.59 
1973 10 16.02   5.68  10.85 
1973 11  6.59    .55   3.57 
1973 12 -1.00  -7.31  -4.15 
1974 01 -1.79  -9.89  -5.84 
1974 02 -3.71 -12.28  -7.99 
1974 03  2.66  -4.50   -.91 
1974 04 12.74   1.61   7.17 
1974 05 15.91   4.66  10.28 
1974 06 22.52  10.77  16.64 
1974 07 26.42  13.86  20.14 
1974 08 26.18  13.48  19.83 
1974 09 19.48   7.85  13.66 
1974 10 13.47   1.47   7.47 
1974 11  6.21    .36   3.28 
1974 12  1.37  -4.01  -1.32 
1975 01   .11  -6.98  -3.43 
1975 02 -1.26  -6.42  -3.84 
1975 03   .63  -6.05  -2.71 
1975 04  7.30  -2.02   2.64 
1975 05 21.76   9.41  15.58 
1975 06 23.84  12.49  18.16 
1975 07 27.21  14.48  20.84 
1975 08 24.98  14.17  19.57 
1975 09 17.84   8.47  13.15 
1975 10 15.30   4.92  10.11 
1975 11 10.58   1.82   6.20 
1975 12 -1.15  -8.67  -4.91 
1976 01 -4.67 -14.42  -9.54 
1976 02  2.09  -6.18  -2.04 
1976 03  4.77  -3.91    .42 
1976 04 13.19   2.53   7.85 
1976 05 15.82   5.77  10.79 
1976 06 24.87  12.64  18.75 
1976 07 24.28  13.65  18.96 
1976 08 24.06  13.04  18.54 
1976 09 19.87   9.21  14.54 
1976 10 10.39   1.86   6.12 
1976 11  3.27  -3.98   -.35 
1976 12 -3.41 -11.52  -7.46 
1977 01 -8.13 -15.86 -11.99 
1977 02 -2.60  -9.93  -6.26 
1977 03  6.40  -2.57   1.91 
1977 04 13.38   2.02   7.70 
1977 06 22.70  10.70  16.70 
1977 07 26.53  15.47  21.00 
1977 08 23.68  13.27  18.47 
1977 09 19.18  11.55  15.36 
1977 10 12.89   3.50   8.19 
1977 11  6.72    .77   3.74 
1977 12 -1.47  -7.50  -4.48 
1978 01 -5.18 -12.45  -8.81 
1978 02 -5.52 -15.73 -10.62 
1978 03   .50  -8.50  -4.00 
1978 04  9.13   -.52   4.30 
1978 05 18.76   7.19  12.97 
1978 06 24.32  11.27  17.79 
1978 07 26.47  14.15  20.31 
1978 08 26.02  13.58  19.79 
1978 09 20.48   9.30  14.89 
1978 10 12.92   3.53   8.22 
1978 11  6.84  -1.80   2.52 
1978 12   .45  -6.26  -2.90 
1979 01 -4.87 -11.19  -8.03 
1979 02 -6.57 -15.57 -11.07 
1979 03  5.87  -3.18   1.34 
1979 04  9.78    .78   5.28 
1979 05 17.11   6.37  11.74 
1979 06 23.55  11.15  17.34 
1979 07 27.05  14.24  20.64 
1979 08 23.94  13.45  18.69 
1979 09 21.32   9.20  15.26 
1979 10 11.97 -99.99 -99.99 
1979 11  7.54    .32   3.93 
1979 12  1.68  -4.15  -1.23 
1980 01 -1.82  -8.21  -5.01 
1980 02 -3.50 -11.67  -7.58 
1980 03  1.57  -5.79  -2.10 
1980 04 10.90   1.30   6.10 
1980 05 20.11   8.08  14.09 
1980 06 21.22   9.37  15.29 
1980 07 26.76  14.87  20.81 
1980 08 26.19  15.89  21.04 
1980 09 20.85   9.27  15.06 
1980 10 10.61   2.92   6.76 
1980 11  5.22  -1.42   1.89 
1980 12 -2.13 -10.44  -6.28 
1981 01 -5.52 -14.35  -9.93 
1981 02  1.75  -6.45  -2.34 
1981 03  4.67  -4.29    .19 
1981 04 12.25   2.45   7.35 
1981 05 18.06   5.63  11.84 
1981 06 23.70  11.80  17.75 
1981 07 26.32  14.65  20.48 
1981 08 24.60  14.05  19.32 
1981 09 18.85  10.43  14.64 
1981 10 11.02   2.48   6.75 
1981 11  7.42   -.48   3.47 
1981 12   .13  -5.94  -2.90 
1982 01 -5.06 -14.66  -9.85 
1982 02 -3.14 -11.18  -7.16 
1982 03  2.29  -5.90  -1.80 
1982 04 10.10   -.52   4.78 
1982 05 20.16   8.87  14.51 
1982 06 20.68  10.33  15.50 
1982 07 26.74  14.16  20.45 
1982 08 23.19  12.15  17.67 
1982 09 19.70   9.60  14.65 
1982 10 15.29   3.92   9.60 
1982 11  7.42    .90   4.16 
1982 12  4.31  -2.89    .70 
1983 01 -1.26  -7.84  -4.55 
1983 03  4.10  -3.85    .12 
1983 04  9.97    .58   5.28 
1983 05 15.39   4.31   9.85 
1983 06 25.05  10.35  17.70 
1983 07 28.29  15.72  22.00 
1983 08 26.39  15.24  20.81 
1983 09 22.20  10.47  16.33 
1983 10 13.39   4.73   9.06 
1983 11  6.32    . 0   3.16 
1983 12 -3.35  -9.16  -6.25 
1984 01 -5.03 -13.82  -9.42 
1984 02  1.98  -5.24  -1.62 
1984 03  -.81  -9.29  -5.05 
1984 04 11.68   1.90   6.79 
1984 05 15.40   5.37  10.38 
1984 06 24.40  11.93  18.16 
1984 07 25.56  13.16  19.36 
1984 08 26.26  15.15  20.70 
1984 09 18.82   8.43  13.62 
1984 10 15.61   5.58  10.59 
1984 11  6.42  -1.63   2.39 
1984 12  2.97  -3.97   -.50 
1985 01 -4.46 -11.89  -8.18 
1985 02 -2.10  -9.77  -5.94 
1985 03  3.97  -4.53   -.28 
1985 04 13.53   1.97   7.75 
1985 05 19.89   7.06  13.47 
1985 06 21.53   9.33  15.43 
1985 07 25.35  13.60  19.47 
1985 08 24.63  12.37  18.50 
1985 09 22.10  10.58  16.34 
1985 10 14.25   4.00   9.12 
1985 11  5.19    .21   2.70 
1985 12 -2.34  -8.93  -5.64 
1986 01 -2.44  -9.85  -6.14 
1986 02 -3.43 -10.59  -7.01 
1986 03  5.24  -4.35    .44 
1986 04 13.22   1.63   7.42 
1986 05 19.69   8.52  14.10 
1986 06 22.32  10.03  16.17 
1986 07 25.95  14.87  20.41 
1986 08 23.79  11.85  17.82 
1986 09 19.23   8.95  14.09 
1986 10 13.35   4.16   8.75 
1986 11  4.98  -3.02    .98 
1986 12   .50  -4.34  -1.92 
1987 02 -1.50 -11.57  -6.53 
1987 03  6.30  -4.73    .78 
1987 04 13.23   2.36   7.80 
