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      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="69.064" BBK_DIFF="14.1" BBK_DIFF_Y="-10.9"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="60.548" BBK_DIFF="-24.9" BBK_DIFF_Y="88.1"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="80.672" BBK_DIFF="5.1" BBK_DIFF_Y="8.3"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="76.735" BBK_DIFF="37.3" BBK_DIFF_Y="37.3"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="55.903" BBK_DIFF="20.3" BBK_DIFF_Y="-32.0"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="46.477" BBK_DIFF="-50.8" BBK_DIFF_Y="-19.2"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="94.525" BBK_DIFF="23.2" BBK_DIFF_Y="58.2"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="76.734" BBK_DIFF="42.5"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="53.847" BBK_DIFF="-4.1"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="56.124" BBK_DIFF="-12.3"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="63.997" BBK_DIFF="1.6"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="62.99" BBK_DIFF="-18.7"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="77.509" BBK_DIFF="140.8"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="32.182" BBK_DIFF="-56.8"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="74.509" BBK_DIFF="33.3"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="55.905" BBK_DIFF="-32.0"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="82.232" BBK_DIFF="42.9"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="57.527" BBK_DIFF="-3.7"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="59.747"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
