1967 04  3.42  -1.08   1.17 
1967 05 10.06   3.84   6.95 
1967 06 13.93   8.82  11.37 
1967 07 17.09  13.12  15.10 
1967 08 17.19  12.94  15.06 
1967 09 13.60   9.52  11.56 
1967 10  9.13   5.68   7.40 
1967 11  6.12   2.99   4.55 
1967 12 -4.06 -10.25  -7.15 
1968 01 -7.21 -15.37 -11.29 
1968 02 -3.00 -10.88  -6.94 
1968 03  -.24  -6.42  -3.33 
1968 04  3.37  -2.57    .39 
1968 05  7.08   1.70   4.39 
1968 06 14.83   9.96  12.39 
1968 07 16.07  11.29  13.68 
1968 08 15.74  11.37  13.55 
1968 09 11.95   7.74   9.84 
1968 10  4.54    .13   2.33 
1968 11   . 7  -2.98  -1.45 
1968 12   .91  -2.08   -.58 
1969 01 -3.49  -9.97  -6.73 
1969 02 -6.73 -14.22 -10.47 
1969 03 -4.32 -12.30  -8.31 
1969 04  3.04  -2.26    .39 
1969 05  8.56   2.71   5.63 
1969 06 15.34   9.59  12.46 
1969 07 17.16  12.61  14.88 
1969 08 19.24  13.80  16.52 
1969 09 11.26   7.48   9.37 
1969 10  7.35   4.25   5.80 
1969 11  1.96  -1.53    .21 
1969 12 -2.32  -7.23  -4.77 
1970 01 -4.57  -9.76  -7.16 
1970 02 -8.75 -16.61 -12.68 
1970 03  -.75  -7.65  -4.19 
1970 04  2.21  -3.22   -.50 
1970 05  8.29   2.77   5.53 
1970 06 16.53  10.72  13.62 
1970 07 18.43  13.72  16.07 
1970 08 17.49  13.25  15.37 
1970 09 11.72   8.03   9.87 
1970 10  6.64   3.48   5.06 
1970 11  1.30  -2.28   -.49 
1970 12   .72  -3.30  -1.29 
1971 01   .27  -3.92  -1.82 
1971 02 -3.18  -8.17  -5.67 
1971 03 -2.90  -9.72  -6.31 
1971 04  2.30  -2.81   -.25 
1971 05  8.51   3.57   6.04 
1971 06 14.56   9.14  11.85 
1971 07 16.79  11.58  14.19 
1971 08 17.20  13.15  15.17 
1971 09 11.66   7.75   9.70 
1971 10  7.05   3.23   5.14 
1971 11  1.54  -3.61  -1.03 
1971 12  1.27  -2.80   -.76 
1972 01 -3.20  -8.03  -5.61 
1972 02 -2.29  -7.79  -5.04 
1972 03  -.36  -6.94  -3.65 
1972 04  2.85  -1.77    .53 
1972 05 10.08   3.19   6.63 
