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      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="2.296" BBK_DIFF="299.3" BBK_DIFF_Y="341.5"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="0.575" BBK_DIFF="-23.2" BBK_DIFF_Y="-98.0"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="0.749" BBK_DIFF="-95.4" BBK_DIFF_Y="-18.6"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="16.432" BBK_DIFF="1954.0" BBK_DIFF_Y="2195.0"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="0.8" BBK_DIFF="20.8" BBK_DIFF_Y="-97.2"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="0.662" BBK_DIFF="-97.7" BBK_DIFF_Y="-55.1"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="28.369" BBK_DIFF="-1.2" BBK_DIFF_Y="1294.1"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="28.708" BBK_DIFF="4442.4"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="0.632" BBK_DIFF="-19.1"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="0.781" BBK_DIFF="-97.2"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="28.067" BBK_DIFF="2657.1"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="1.018" BBK_DIFF="95.8"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="0.52" BBK_DIFF="-98.2"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="28.388" BBK_DIFF="2985.7"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="0.92" BBK_DIFF="28.5"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="0.716" BBK_DIFF="-97.5"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="28.96" BBK_DIFF="1862.1"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="1.476" BBK_DIFF="-27.5"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="2.035"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
