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      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="-74.888" BBK_DIFF="-4.9" BBK_DIFF_Y="-67.5"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="-71.373" BBK_DIFF="-45.0" BBK_DIFF_Y="17.9"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="-49.231" BBK_DIFF="21.6" BBK_DIFF_Y="40.5"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="-62.821" BBK_DIFF="32.2" BBK_DIFF_Y="10.0"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="-92.691" BBK_DIFF="16.8" BBK_DIFF_Y="-62.1"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="-111.47" BBK_DIFF="0.1" BBK_DIFF_Y="-22.9"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="-111.59" BBK_DIFF="-92.6" BBK_DIFF_Y="-18.6"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="-57.924" BBK_DIFF="39.3"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="-95.437" BBK_DIFF="-7.7"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="-88.632" BBK_DIFF="-23.9"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="-71.543" BBK_DIFF="8.5"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="-78.192" BBK_DIFF="-74.9"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="-44.699" BBK_DIFF="48.6"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="-86.98" BBK_DIFF="-5.0"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="-82.8" BBK_DIFF="-18.6"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="-69.805" BBK_DIFF="-22.1"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="-57.169" BBK_DIFF="37.0"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="-90.705" BBK_DIFF="3.6"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="-94.054"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
