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      <bbk:Obs TIME_PERIOD="1972-09" OBS_VALUE="-16.259" BBK_DIFF="-738.4" BBK_DIFF_Y="-513.5"/>
      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="2.547" BBK_DIFF="-11.3" BBK_DIFF_Y="494.9"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="2.872" BBK_DIFF="-64.0" BBK_DIFF_Y="-89.8"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="7.976" BBK_DIFF="-1.8" BBK_DIFF_Y="244.8"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="8.124" BBK_DIFF="80.4" BBK_DIFF_Y="122.1"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="4.504" BBK_DIFF="109.1" BBK_DIFF_Y="-90.3"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="-49.228" BBK_DIFF="-320.8" BBK_DIFF_Y="-350.0"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="-11.7" BBK_DIFF="-214.0" BBK_DIFF_Y="-899.7"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="10.264" BBK_DIFF="-85.0" BBK_DIFF_Y="53.0"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="68.533" BBK_DIFF="148.2"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="27.611" BBK_DIFF="3977.9"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="-0.712" BBK_DIFF="-118.1"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="3.932" BBK_DIFF="709.6"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="-0.645" BBK_DIFF="-102.3"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="28.2" BBK_DIFF="612.0"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="-5.508" BBK_DIFF="85.0"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="-36.778" BBK_DIFF="-179.3"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="46.37" BBK_DIFF="135.5"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="19.69" BBK_DIFF="1245.9"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="1.463" BBK_DIFF="-78.2"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="6.707"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
