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      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="0.945" BBK_DIFF="-62.5" BBK_DIFF_Y="-66.8"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="2.521" BBK_DIFF="278.0" BBK_DIFF_Y="15.5"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="0.667" BBK_DIFF="18.9" BBK_DIFF_Y="-78.0"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="0.561" BBK_DIFF="-79.1" BBK_DIFF_Y="-84.8"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="2.69" BBK_DIFF="0.0" BBK_DIFF_Y="-86.2"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="2.689" BBK_DIFF="189.8" BBK_DIFF_Y="-25.7"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="0.928" BBK_DIFF="-63.6" BBK_DIFF_Y="347.5"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="2.552" BBK_DIFF="-97.9" BBK_DIFF_Y="-43.8"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="122.864" BBK_DIFF="2237.6"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="5.256" BBK_DIFF="-23.4"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="6.864" BBK_DIFF="159.9"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="2.641" BBK_DIFF="-7.2"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="2.847" BBK_DIFF="30.4"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="2.183" BBK_DIFF="-27.9"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="3.026" BBK_DIFF="-17.8"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="3.682" BBK_DIFF="-81.0"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="19.425" BBK_DIFF="436.6"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="3.62" BBK_DIFF="1065.3"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="-0.375" BBK_DIFF="-108.3"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="4.544"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
