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      <bbk:Obs TIME_PERIOD="1972-10" OBS_VALUE="150.438" BBK_DIFF="-35.3" BBK_DIFF_Y="84.8"/>
      <bbk:Obs TIME_PERIOD="1972-09" OBS_VALUE="232.458" BBK_DIFF="-30.7" BBK_DIFF_Y="40.8"/>
      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="335.435" BBK_DIFF="30.8" BBK_DIFF_Y="99.9"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="256.474" BBK_DIFF="-46.0" BBK_DIFF_Y="5.7"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="474.888" BBK_DIFF="553.1" BBK_DIFF_Y="245.4"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="-104.808" BBK_DIFF="-211.5" BBK_DIFF_Y="-179.4"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="93.985" BBK_DIFF="-24.4" BBK_DIFF_Y="35.9"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="124.393" BBK_DIFF="-37.3" BBK_DIFF_Y="-11.9"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="198.401" BBK_DIFF="100.2" BBK_DIFF_Y="19.4"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="99.079" BBK_DIFF="-88.2" BBK_DIFF_Y="-23.1"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="837.036" BBK_DIFF="378.7"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="174.869" BBK_DIFF="114.8"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="81.405" BBK_DIFF="-50.7"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="165.072" BBK_DIFF="-1.6"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="167.823" BBK_DIFF="-30.8"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="242.674" BBK_DIFF="76.5"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="137.47" BBK_DIFF="4.1"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="132.003" BBK_DIFF="90.8"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="69.173" BBK_DIFF="-51.0"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="141.236" BBK_DIFF="-15.0"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="166.117" BBK_DIFF="28.9"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="128.894"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
