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      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="7.843" BBK_DIFF="182.8" BBK_DIFF_Y="7.3"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="-9.473" BBK_DIFF="-988.6" BBK_DIFF_Y="-1571.0"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="1.066" BBK_DIFF="-88.9" BBK_DIFF_Y="-96.2"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="9.615" BBK_DIFF="-69.3" BBK_DIFF_Y="107.1"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="31.355" BBK_DIFF="345.7" BBK_DIFF_Y="-28.0"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="-12.763" BBK_DIFF="-232.7" BBK_DIFF_Y="-109.0"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="9.618" BBK_DIFF="77.3"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="5.425" BBK_DIFF="-63.9"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="15.048" BBK_DIFF="153.6"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="-28.094" BBK_DIFF="-258.5"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="17.726" BBK_DIFF="30.5"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="13.588" BBK_DIFF="85.8"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="7.312" BBK_DIFF="1035.4"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="0.644" BBK_DIFF="-97.7"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="27.919" BBK_DIFF="120.7"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="-135.08" BBK_DIFF="-410.3"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="43.533" BBK_DIFF="-69.3"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="142.005"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
