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      <bbk:Obs TIME_PERIOD="1972-09" OBS_VALUE="46.099" BBK_DIFF="453.6" BBK_DIFF_Y="857.0"/>
      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="8.327" BBK_DIFF="3.6" BBK_DIFF_Y="-9.5"/>
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      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="10.62" BBK_DIFF="-62.7" BBK_DIFF_Y="-47.3"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="28.469" BBK_DIFF="228.0" BBK_DIFF_Y="-26.2"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="8.679" BBK_DIFF="51.3" BBK_DIFF_Y="166.5"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="5.735" BBK_DIFF="-48.2" BBK_DIFF_Y="35.9"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="11.069" BBK_DIFF="-26.9" BBK_DIFF_Y="51.6"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="15.142" BBK_DIFF="140.5"/>
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      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="51.238" BBK_DIFF="963.7"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="4.817" BBK_DIFF="-47.7"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="9.206" BBK_DIFF="48.7"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="6.192" BBK_DIFF="-76.4"/>
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      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="38.575" BBK_DIFF="1084.4"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="3.257" BBK_DIFF="-22.8"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="4.22" BBK_DIFF="-42.2"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="7.301"/>
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  </bbk:DataSet>
</CompactData>
