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      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="-11.341" BBK_DIFF="73.2" BBK_DIFF_Y="-169.8"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="-42.39" BBK_DIFF="-169.2" BBK_DIFF_Y="-586.8"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="61.3" BBK_DIFF="321.5" BBK_DIFF_Y="432.4"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="14.544" BBK_DIFF="29.4"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="11.242" BBK_DIFF="-57.8"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="26.62" BBK_DIFF="40.6"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="18.931" BBK_DIFF="71.6"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="11.031" BBK_DIFF="-7.0"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="11.867" BBK_DIFF="-63.7"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="32.694" BBK_DIFF="500.8"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="5.442" BBK_DIFF="-82.9"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="31.849" BBK_DIFF="95.9"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="16.254" BBK_DIFF="86.7"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="8.707" BBK_DIFF="-24.4"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="11.514"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
