1968 03 20.45 -99.99 -99.99 
1968 04 25.83 -99.99 -99.99 
1968 05 29.60 -99.99 -99.99 
1968 06 31.30  21.38  26.34 
1968 07 32.95  21.67  27.31 
1968 08 34.78  21.05  27.91 
1968 09 31.41  17.44  24.42 
1968 10 29.59  14.01  21.80 
1968 11 23.35   5.79  14.57 
1968 12 19.14   3.13  11.13 
1969 01 18.48   5.77  12.12 
1969 02 19.29   7.06  13.17 
1969 03 19.18   6.19  12.68 
1969 04 26.64  14.28  20.45 
1969 05 29.29  16.25  22.77 
1969 07 36.88  21.64  29.26 
1969 08 36.99  20.18  28.58 
1969 09 33.24  17.12  25.18 
1969 10 29.06  12.61  20.83 
1969 11 23.00   6.17  14.58 
1969 12 20.70   7.60  14.15 
1970 01 14.22   3.50   8.86 
1970 02 19.10   7.71  13.40 
1970 03 20.56   8.50  14.53 
1970 04 26.15  16.46  21.31 
1970 05 27.86  17.32  22.59 
1970 06 31.16  21.06  26.11 
1970 07 32.75  21.78  27.26 
1970 08 34.91  21.65  28.28 
1970 09 30.95  20.23  25.59 
1970 10 27.00  12.18  19.59 
1970 11 22.71   4.46  13.58 
1970 12 22.87   8.68  15.77 
1971 01 21.02   6.27  13.64 
1971 02 21.49   4.61  13.05 
1971 03 24.98   7.29  16.13 
1971 04 26.39  11.68  19.03 
1971 05 29.78  17.70  23.74 
1971 06 33.57  20.75  27.16 
1971 07 35.98  21.42  28.70 
1971 08 33.93  20.11  27.02 
1971 09 31.22  18.58  24.90 
1971 10 28.64  14.15  21.39 
1971 11 24.09   6.66  15.37 
1971 12 21.53   7.50  14.51 
1972 01 19.76   4.42  12.09 
1972 02 20.17   4.37  12.27 
1972 03 25.83   8.74  17.28 
1972 04 29.25  13.19  21.22 
1972 05 29.64  14.16  21.90 
1972 06 32.75 -99.99 -99.99 
1972 07 32.91  17.14  25.03 
1972 08 33.41 -99.99 -99.99 
1972 09 33.00  21.40  27.20 
1972 10 28.48  14.39  21.43 
1972 11 18.45   5.70  12.08 
1972 12 15.41   1.75   8.58 
1973 01 14.66   2.11   8.38 
1973 02 17.56   4.30  10.93 
1973 03 24.41  11.81  18.11 
1973 04 23.60  12.57  18.08 
1973 05 28.94  16.59  22.76 
1973 06 30.52  20.07  25.29 
1973 07 34.25  20.57  27.41 
1973 08 33.66  18.52  26.09 
