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      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="-304.819" BBK_DIFF="4.3" BBK_DIFF_Y="-1.6"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="-318.585" BBK_DIFF="-19.2" BBK_DIFF_Y="-10.7"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="-267.331" BBK_DIFF="15.7" BBK_DIFF_Y="1.5"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="-316.938" BBK_DIFF="-19.7" BBK_DIFF_Y="-27.0"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="-264.724" BBK_DIFF="28.1" BBK_DIFF_Y="-3.4"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="-368.343" BBK_DIFF="-55.8" BBK_DIFF_Y="-16.5"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="-236.397" BBK_DIFF="1.6" BBK_DIFF_Y="-5.2"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="-240.15" BBK_DIFF="-55.2" BBK_DIFF_Y="-1.8"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="-154.714" BBK_DIFF="40.4"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="-259.439" BBK_DIFF="10.9"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="-291.178" BBK_DIFF="14.1"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="-339.009" BBK_DIFF="-12.9"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="-300.15" BBK_DIFF="-4.2"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="-287.915" BBK_DIFF="-6.1"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="-271.402" BBK_DIFF="-8.8"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="-249.52" BBK_DIFF="2.5"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="-255.905" BBK_DIFF="19.0"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="-316.043" BBK_DIFF="-40.6"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="-224.743" BBK_DIFF="4.8"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="-235.994"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
