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      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="-51.59" BBK_DIFF="54.0" BBK_DIFF_Y="36.0"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="-112.231" BBK_DIFF="-4788.1" BBK_DIFF_Y="-764.8"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="-2.296" BBK_DIFF="-103.4" BBK_DIFF_Y="-106.0"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="67.992" BBK_DIFF="372.7" BBK_DIFF_Y="21.5"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="-24.936" BBK_DIFF="-118.3" BBK_DIFF_Y="92.2"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="136.463" BBK_DIFF="502.2"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="-33.933" BBK_DIFF="-280.3"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="-8.923" BBK_DIFF="51.3"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="-18.34" BBK_DIFF="-146.3"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="39.593" BBK_DIFF="846.3"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="4.184" BBK_DIFF="-97.9"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="202.294" BBK_DIFF="351.1"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="-80.567" BBK_DIFF="-577.2"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="16.882" BBK_DIFF="-55.8"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="38.208" BBK_DIFF="-31.7"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="55.942" BBK_DIFF="117.5"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="-320.282"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
