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      <bbk:Obs TIME_PERIOD="1972-11" OBS_VALUE="59.19" BBK_DIFF="-1.7" BBK_DIFF_Y="-9.6"/>
      <bbk:Obs TIME_PERIOD="1972-10" OBS_VALUE="60.211" BBK_DIFF="1.7" BBK_DIFF_Y="-7.7"/>
      <bbk:Obs TIME_PERIOD="1972-09" OBS_VALUE="59.215" BBK_DIFF="2.0" BBK_DIFF_Y="-9.3"/>
      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="58.062" BBK_DIFF="32.3" BBK_DIFF_Y="-11.7"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="43.903" BBK_DIFF="-30.3" BBK_DIFF_Y="-33.7"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="62.986" BBK_DIFF="1.5" BBK_DIFF_Y="-9.1"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="62.038" BBK_DIFF="-0.1" BBK_DIFF_Y="-10.3"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="62.086" BBK_DIFF="1.8" BBK_DIFF_Y="-9.9"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="60.986" BBK_DIFF="1.2" BBK_DIFF_Y="-11.8"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="60.284" BBK_DIFF="0.5" BBK_DIFF_Y="-12.5"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="59.958" BBK_DIFF="-8.1" BBK_DIFF_Y="-12.5"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="65.214" BBK_DIFF="-0.4"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="65.458" BBK_DIFF="0.3"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="65.241" BBK_DIFF="0.0"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="65.273" BBK_DIFF="-0.8"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="65.775" BBK_DIFF="-0.7"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="66.24" BBK_DIFF="-4.4"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="69.294" BBK_DIFF="0.2"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="69.172" BBK_DIFF="0.3"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="68.945" BBK_DIFF="-0.3"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="69.165" BBK_DIFF="0.4"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="68.913" BBK_DIFF="0.6"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="68.499"/>
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  </bbk:DataSet>
</CompactData>
