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      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="16.521" BBK_DIFF="0.3" BBK_DIFF_Y="130.9"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="16.475" BBK_DIFF="7.0" BBK_DIFF_Y="130.2"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="15.404" BBK_DIFF="0.3" BBK_DIFF_Y="42.3"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="15.357" BBK_DIFF="0.3" BBK_DIFF_Y="41.8"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="15.314" BBK_DIFF="47.5" BBK_DIFF_Y="41.4"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="10.379" BBK_DIFF="0.4"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="10.34" BBK_DIFF="0.4"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="10.299" BBK_DIFF="-11.7"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="11.669" BBK_DIFF="0.4"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="11.624" BBK_DIFF="0.1"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="11.609" BBK_DIFF="62.2"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="7.158" BBK_DIFF="0.1"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="7.154" BBK_DIFF="0.0"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="7.157" BBK_DIFF="-33.9"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="10.825" BBK_DIFF="-0.1"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="10.831" BBK_DIFF="0.0"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="10.834"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
