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      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="-64.027" BBK_DIFF="-35.3" BBK_DIFF_Y="13.3"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="-47.338" BBK_DIFF="-5.7" BBK_DIFF_Y="-8.2"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="-44.767" BBK_DIFF="-4.8" BBK_DIFF_Y="4.4"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="-42.718" BBK_DIFF="1.3" BBK_DIFF_Y="-73.0"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="-43.296" BBK_DIFF="40.4" BBK_DIFF_Y="8.5"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="-72.661" BBK_DIFF="-27.6"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="-56.956" BBK_DIFF="-8.2"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="-52.651" BBK_DIFF="-13.2"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="-46.512" BBK_DIFF="-13.7"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="-40.919" BBK_DIFF="44.0"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="-73.073" BBK_DIFF="32.2"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="-107.745" BBK_DIFF="-45.9"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="-73.864" BBK_DIFF="-68.8"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="-43.768" BBK_DIFF="6.5"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="-46.811" BBK_DIFF="-89.6"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="-24.694" BBK_DIFF="47.8"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="-47.307"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
