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      <bbk:Obs TIME_PERIOD="1972-09" OBS_VALUE="-17.266" BBK_DIFF="57.6" BBK_DIFF_Y="23.9"/>
      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="-40.739" BBK_DIFF="-27.6" BBK_DIFF_Y="-2622.5"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="-31.933" BBK_DIFF="20.6" BBK_DIFF_Y="-515.4"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="-40.193" BBK_DIFF="-339.9" BBK_DIFF_Y="-1680.0"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="-9.136" BBK_DIFF="-152.3" BBK_DIFF_Y="-162.3"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="17.469" BBK_DIFF="192.4" BBK_DIFF_Y="151.9"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="-18.898" BBK_DIFF="-177.8" BBK_DIFF_Y="84.2"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="24.278" BBK_DIFF="458.4" BBK_DIFF_Y="-48.3"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="4.348" BBK_DIFF="108.7" BBK_DIFF_Y="-95.1"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="-49.803" BBK_DIFF="-220.6"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="41.279" BBK_DIFF="1943.6"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="-2.239" BBK_DIFF="90.1"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="-22.701" BBK_DIFF="-1505.6"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="1.615" BBK_DIFF="131.1"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="-5.189" BBK_DIFF="-129.8"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="-2.258" BBK_DIFF="-115.4"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="14.657" BBK_DIFF="111.3"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="6.935" BBK_DIFF="105.8"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="-119.469" BBK_DIFF="-354.6"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="46.929" BBK_DIFF="-46.9"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="88.395"/>
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  </bbk:DataSet>
</CompactData>
