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      <bbk:Obs TIME_PERIOD="1972-09" OBS_VALUE="6.844" BBK_DIFF="-0.1" BBK_DIFF_Y="12.2"/>
      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="6.85" BBK_DIFF="-13.2" BBK_DIFF_Y="0.0"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="7.891" BBK_DIFF="32.6" BBK_DIFF_Y="5.2"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="5.95" BBK_DIFF="-17.3" BBK_DIFF_Y="-14.9"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="7.198" BBK_DIFF="3.7" BBK_DIFF_Y="-10.6"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="6.939" BBK_DIFF="18.9" BBK_DIFF_Y="14.6"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="5.834" BBK_DIFF="-7.4" BBK_DIFF_Y="-9.6"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="6.297" BBK_DIFF="-10.3" BBK_DIFF_Y="-0.2"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="7.017" BBK_DIFF="-21.6" BBK_DIFF_Y="7.4"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="8.948" BBK_DIFF="16.7"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="7.669" BBK_DIFF="0.9"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="7.598" BBK_DIFF="24.6"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="6.1" BBK_DIFF="-10.9"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="6.848" BBK_DIFF="-8.7"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="7.504" BBK_DIFF="7.3"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="6.993" BBK_DIFF="-13.1"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="8.051" BBK_DIFF="33.0"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="6.054" BBK_DIFF="-6.2"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="6.457" BBK_DIFF="2.3"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="6.311" BBK_DIFF="-3.4"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="6.533"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
