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      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="17.835" BBK_DIFF="-59.1" BBK_DIFF_Y="-83.6"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="43.61" BBK_DIFF="305.2" BBK_DIFF_Y="599.9"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="-21.253" BBK_DIFF="-143.8" BBK_DIFF_Y="-234.2"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="48.539" BBK_DIFF="223.4" BBK_DIFF_Y="231.0"/>
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      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="-8.724" BBK_DIFF="-155.1"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="15.831" BBK_DIFF="8.0"/>
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  </bbk:DataSet>
</CompactData>
