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      <bbk:Obs TIME_PERIOD="1972-09" OBS_VALUE="30.911" BBK_DIFF="-81.9" BBK_DIFF_Y="-67.7"/>
      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="170.428" BBK_DIFF="71.5" BBK_DIFF_Y="218.1"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="99.392" BBK_DIFF="-15.8" BBK_DIFF_Y="296.7"/>
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      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="10.532" BBK_DIFF="-63.3" BBK_DIFF_Y="-36.9"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="28.733" BBK_DIFF="-66.8" BBK_DIFF_Y="90.6"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="86.432" BBK_DIFF="770.0" BBK_DIFF_Y="-72.4"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="-12.9" BBK_DIFF="-116.9" BBK_DIFF_Y="-140.9"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="76.48" BBK_DIFF="259.0" BBK_DIFF_Y="-17.3"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="21.305" BBK_DIFF="-52.5"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="44.889" BBK_DIFF="31.1"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="34.251" BBK_DIFF="-64.3"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="95.83" BBK_DIFF="78.9"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="53.575" BBK_DIFF="113.8"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="25.056" BBK_DIFF="-13.4"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="28.939" BBK_DIFF="73.3"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="16.695" BBK_DIFF="10.7"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="15.077" BBK_DIFF="-95.2"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="313.277" BBK_DIFF="893.5"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="31.532" BBK_DIFF="-65.9"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="92.439"/>
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  </bbk:DataSet>
</CompactData>
