125
        Jan     Feb     Mar     Apr     May     Jun     Jul     Aug     Sep      Oct     Nov     Dec
1961    -111    -112    -87     -29     -20     19      43      53      22      -16     -44    -85
1962    -82     -136    -81     -61     -5      15      56      75      34      -7      -40    -107
1963    -129    -104    -107    -57     -17     24      46      72      40      -21     -22    -76
1964    -123    -122    -77     -60     -24     32      35      44       6      -9      -56    -82
1965    -96     -160    -93     -77     -19     20      60      32      47      -16     -56    -75
1966    -118    -63     -100    -44     -27     17      47      53      24      14      -52    -98
1967    -134    -118    -92     -57     -11      7      44      57      24      2       -48    -98
1968    -140    -82     -106    -29     28      29      46      35      18      -19     -41    -94
1969    -115    -98     -83     -71     24      20      23      49      33      -9      -28    -90
1970    -85     -109    -83     -42     -34     19      47      45      15      -29     -43    -91
1971    -78     -122    -101    -56     -2      25      26      60       3      -28     -64    -90
1972    -99     -87     -70     -34     7       42      42      34       2      -45     -42    -65
1973    -100    -102    -109    -64     6       23      47      36      35      -10     -73    -81
1974    -113    -87     -60     -75     -29     12      45      46      24      -22     -60    -99
1975    -88     -125    -67     -51     -5      26      46      39      34      -27     -56    -78
1976    -117    -117    -103    -51     -9       7      31      10       6      10      -57    -91
1977    -92     -75     -69     -55     0       19      58      52       2      -7      -39    -98
1978    -111    -86     -84     -60     -20     22      43      31       3      -11     -35    -77
1979    -112    -95     -71     -67     -7      37      36      38      26      -12     -54    -71
1980    -123    -119    -91     -76     -25     21      52      55      12      -9      -35    -91
1981    -137    -110    -58     -55     -20     48      41      42      23      6       -88    -82
1982    -85     -123    -85     -58     -5      32      32      53      50      2       -26    -79
1983    -103    -144    -83     -32     -3      11      46      39      35      -8      -59    -78
1984    -88     -97     -99     -74     1       19      38      30      28      9       -44    -85
1985    -105    -147    -69     -43     11      17      46      59      21      -21     -42    -66
1986    -111    -106    -66     -26     -4      22      41      70      40      -17     -44    -90
1987    -108    -89     -139    -68     -30     27      75      50      51      -18     -58    -85
1988    -72     -107    -103    -57     2       16      79      71      19      -17     -90    -96
1989    -84     -86     -65     -15     -20      5      46      52      15      -21     -73    -75
1990    -77     -83     -55     -54     12      23      58      50       9      12      -42    -94