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      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="1.193" BBK_DIFF="1.0" BBK_DIFF_Y="1117.3"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="1.181" BBK_DIFF="1.2" BBK_DIFF_Y="1868.3"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="1.167" BBK_DIFF="1.1" BBK_DIFF_Y="1845.0"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="1.154" BBK_DIFF="1.0" BBK_DIFF_Y="1855.9"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="1.143" BBK_DIFF="1.1" BBK_DIFF_Y="1837.3"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="1.131" BBK_DIFF="74.3" BBK_DIFF_Y="1031.0"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="0.649" BBK_DIFF="1.4"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="0.64" BBK_DIFF="1.6"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="0.63" BBK_DIFF="70.7"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="0.369" BBK_DIFF="25.1"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="0.295" BBK_DIFF="87.9"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="0.157" BBK_DIFF="60.2"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="0.098" BBK_DIFF="63.3"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="0.06" BBK_DIFF="0.0"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="0.06" BBK_DIFF="1.7"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="0.059" BBK_DIFF="0.0"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="0.059" BBK_DIFF="-41.0"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="0.1"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
