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      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="71.847" BBK_DIFF="0.5" BBK_DIFF_Y="-6.8"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="71.515" BBK_DIFF="3.1" BBK_DIFF_Y="-7.9"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="69.351" BBK_DIFF="-0.8" BBK_DIFF_Y="-13.4"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="69.928" BBK_DIFF="0.9" BBK_DIFF_Y="-14.0"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="69.324" BBK_DIFF="-0.4" BBK_DIFF_Y="-15.3"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="69.572" BBK_DIFF="-0.3" BBK_DIFF_Y="-16.2"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="69.795" BBK_DIFF="-0.4" BBK_DIFF_Y="-16.8"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="70.103" BBK_DIFF="-2.8" BBK_DIFF_Y="-15.7"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="72.142" BBK_DIFF="-1.3"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="73.069" BBK_DIFF="-0.8"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="73.682" BBK_DIFF="-2.7"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="75.76" BBK_DIFF="-1.8"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="77.114" BBK_DIFF="-0.7"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="77.627" BBK_DIFF="-3.1"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="80.115" BBK_DIFF="-1.4"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="81.265" BBK_DIFF="-0.7"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="81.827" BBK_DIFF="-1.4"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="82.995" BBK_DIFF="-1.1"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="83.89" BBK_DIFF="0.9"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="83.17"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
