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      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="-3.507" BBK_DIFF="-154.9" BBK_DIFF_Y="-71.4"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="6.387" BBK_DIFF="276.4" BBK_DIFF_Y="509.4"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="1.697" BBK_DIFF="221.7" BBK_DIFF_Y="160.6"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="-1.394" BBK_DIFF="72.3" BBK_DIFF_Y="-242.0"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="-5.031" BBK_DIFF="-314.6" BBK_DIFF_Y="-240.3"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="2.344" BBK_DIFF="124.6" BBK_DIFF_Y="194.9"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="-9.522" BBK_DIFF="-150.9" BBK_DIFF_Y="-139.4"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="18.697" BBK_DIFF="478.1"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="-4.945" BBK_DIFF="-263.5"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="3.024" BBK_DIFF="167.7"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="-4.464" BBK_DIFF="-412.8"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="1.427" BBK_DIFF="169.7"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="-2.046" BBK_DIFF="-295.2"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="1.048" BBK_DIFF="137.4"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="-2.799" BBK_DIFF="-385.0"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="0.982" BBK_DIFF="-72.6"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="3.587" BBK_DIFF="245.2"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="-2.471" BBK_DIFF="-110.2"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="24.144"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
