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      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="4.977" BBK_DIFF="-57.9" BBK_DIFF_Y="-54.4"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="11.824" BBK_DIFF="239.8" BBK_DIFF_Y="145.7"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="-8.46" BBK_DIFF="-113.7" BBK_DIFF_Y="28.6"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="-3.959" BBK_DIFF="52.3" BBK_DIFF_Y="-177.6"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="-8.306" BBK_DIFF="47.7" BBK_DIFF_Y="61.2"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="-15.88" BBK_DIFF="-316.4" BBK_DIFF_Y="-251.4"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="7.338" BBK_DIFF="132.4"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="-22.664" BBK_DIFF="-180.9"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="28.013" BBK_DIFF="376.9"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="-10.118" BBK_DIFF="-58.7"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="-6.374" BBK_DIFF="-173.0"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="-2.335" BBK_DIFF="-121.4"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="10.925" BBK_DIFF="142.2"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="-25.864" BBK_DIFF="-118.3"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="-11.85" BBK_DIFF="-332.4"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="5.099" BBK_DIFF="123.8"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="-21.423" BBK_DIFF="-304.2"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="10.49"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
