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      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="-1.535" BBK_DIFF="-133.4" BBK_DIFF_Y="-533.6"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="4.592" BBK_DIFF="-30.3" BBK_DIFF_Y="248.9"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="6.591" BBK_DIFF="340.6" BBK_DIFF_Y="187.0"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="-2.739" BBK_DIFF="-339.6" BBK_DIFF_Y="-245.4"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="-0.623" BBK_DIFF="-148.9" BBK_DIFF_Y="-192.8"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="1.273" BBK_DIFF="224.7" BBK_DIFF_Y="-85.0"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="0.392" BBK_DIFF="402.6" BBK_DIFF_Y="155.4"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="0.078" BBK_DIFF="-97.0" BBK_DIFF_Y="104.7"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="2.579" BBK_DIFF="-46.6"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="4.826" BBK_DIFF="692.9"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="-0.814" BBK_DIFF="-131.8"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="2.558" BBK_DIFF="622.6"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="0.354" BBK_DIFF="-73.1"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="1.316" BBK_DIFF="117.4"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="-7.573" BBK_DIFF="-502.0"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="1.884" BBK_DIFF="180.8"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="0.671" BBK_DIFF="-92.1"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="8.514" BBK_DIFF="1304.2"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="-0.707" BBK_DIFF="57.5"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="-1.663"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
