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      <bbk:Obs TIME_PERIOD="1972-09" OBS_VALUE="155.096" BBK_DIFF="-35.6" BBK_DIFF_Y="28.8"/>
      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="240.95" BBK_DIFF="43.5" BBK_DIFF_Y="97.1"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="167.965" BBK_DIFF="-49.7" BBK_DIFF_Y="-4.5"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="333.764" BBK_DIFF="415.2" BBK_DIFF_Y="227.8"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="64.78" BBK_DIFF="-39.7" BBK_DIFF_Y="-29.0"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="107.341" BBK_DIFF="37.9" BBK_DIFF_Y="146.5"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="77.826" BBK_DIFF="-44.9" BBK_DIFF_Y="-26.9"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="141.344" BBK_DIFF="56.8" BBK_DIFF_Y="7.2"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="90.168" BBK_DIFF="-86.7" BBK_DIFF_Y="1.4"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="680.072" BBK_DIFF="440.9"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="125.72" BBK_DIFF="133.6"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="53.807" BBK_DIFF="-55.3"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="120.44" BBK_DIFF="-1.5"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="122.251" BBK_DIFF="-30.5"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="175.897" BBK_DIFF="72.8"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="101.813" BBK_DIFF="11.7"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="91.187" BBK_DIFF="109.4"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="43.552" BBK_DIFF="-59.1"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="106.418" BBK_DIFF="-19.3"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="131.814" BBK_DIFF="48.3"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="88.903"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
