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      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="-20.253" BBK_DIFF="42.3" BBK_DIFF_Y="21.4"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="-35.126" BBK_DIFF="-25.2" BBK_DIFF_Y="-9.1"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="-28.061" BBK_DIFF="-11.7" BBK_DIFF_Y="-824.9"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="-25.131" BBK_DIFF="-352.8" BBK_DIFF_Y="9.6"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="-5.55" BBK_DIFF="76.7" BBK_DIFF_Y="72.2"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="-23.827" BBK_DIFF="-8.9" BBK_DIFF_Y="-2219.8"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="-21.887" BBK_DIFF="-22.0" BBK_DIFF_Y="6.4"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="-17.946" BBK_DIFF="-560.5" BBK_DIFF_Y="31.1"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="3.897" BBK_DIFF="113.8"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="-28.294" BBK_DIFF="-20.0"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="-23.569" BBK_DIFF="-330.4"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="-5.476" BBK_DIFF="78.7"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="-25.766" BBK_DIFF="20.0"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="-32.204" BBK_DIFF="-961.4"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="-3.034" BBK_DIFF="89.1"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="-27.811" BBK_DIFF="-39.2"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="-19.986" BBK_DIFF="-1878.1"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="1.124" BBK_DIFF="104.8"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="-23.389" BBK_DIFF="10.2"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="-26.034"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
