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      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="-66.003" BBK_DIFF="-6.5" BBK_DIFF_Y="-114.7"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="-61.947" BBK_DIFF="-1228.4" BBK_DIFF_Y="-284.6"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="5.49" BBK_DIFF="113.2" BBK_DIFF_Y="-92.2"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="-41.627" BBK_DIFF="57.6" BBK_DIFF_Y="-115.1"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="-98.062" BBK_DIFF="-441.3" BBK_DIFF_Y="-97.8"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="28.734" BBK_DIFF="148.6" BBK_DIFF_Y="363.5"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="-59.175" BBK_DIFF="-135.8" BBK_DIFF_Y="-232.4"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="165.423" BBK_DIFF="712.4"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="-27.012" BBK_DIFF="-132.1"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="-11.638" BBK_DIFF="40.8"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="-19.67" BBK_DIFF="-210.7"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="17.769" BBK_DIFF="157.8"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="-30.742" BBK_DIFF="-90.8"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="-16.108" BBK_DIFF="-122.8"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="70.513" BBK_DIFF="464.4"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="-19.35" BBK_DIFF="61.0"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="-49.587" BBK_DIFF="-354.8"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="-10.904" BBK_DIFF="38.8"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="-17.804"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
