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      <bbk:Obs TIME_PERIOD="1972-11" OBS_VALUE="15.326" BBK_DIFF="4.2" BBK_DIFF_Y="-12.1"/>
      <bbk:Obs TIME_PERIOD="1972-10" OBS_VALUE="14.703" BBK_DIFF="-0.7" BBK_DIFF_Y="-22.2"/>
      <bbk:Obs TIME_PERIOD="1972-09" OBS_VALUE="14.803" BBK_DIFF="-7.2" BBK_DIFF_Y="-24.1"/>
      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="15.943" BBK_DIFF="8.1" BBK_DIFF_Y="-14.4"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="14.755" BBK_DIFF="-2.2" BBK_DIFF_Y="-24.7"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="15.091" BBK_DIFF="-9.6" BBK_DIFF_Y="-26.6"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="16.7" BBK_DIFF="-2.0" BBK_DIFF_Y="-19.8"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="17.04" BBK_DIFF="-1.8" BBK_DIFF_Y="-14.0"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="17.35" BBK_DIFF="1.0" BBK_DIFF_Y="-13.4"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="17.174" BBK_DIFF="-0.1" BBK_DIFF_Y="-13.6"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="17.198" BBK_DIFF="1.3" BBK_DIFF_Y="-15.1"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="16.971" BBK_DIFF="-2.6"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="17.427" BBK_DIFF="-7.8"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="18.898" BBK_DIFF="-3.1"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="19.506" BBK_DIFF="4.7"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="18.629" BBK_DIFF="-4.9"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="19.593" BBK_DIFF="-4.7"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="20.558" BBK_DIFF="-1.2"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="20.812" BBK_DIFF="5.1"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="19.806" BBK_DIFF="-1.2"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="20.044" BBK_DIFF="0.8"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="19.879" BBK_DIFF="-1.8"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="20.249"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
