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      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="81.613" BBK_DIFF="-29.7" BBK_DIFF_Y="34.1"/>
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      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="72.239" BBK_DIFF="18.1" BBK_DIFF_Y="60.8"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="61.146" BBK_DIFF="-90.2" BBK_DIFF_Y="36.4"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="626.9" BBK_DIFF="404.4" BBK_DIFF_Y="329.8"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="124.283" BBK_DIFF="-34.1" BBK_DIFF_Y="-1.0"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="188.716" BBK_DIFF="-2.0" BBK_DIFF_Y="51.6"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="192.477" BBK_DIFF="88.6"/>
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      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="33.489" BBK_DIFF="-53.7"/>
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      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="60.867" BBK_DIFF="-40.8"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="102.834" BBK_DIFF="2.5"/>
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      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="44.934" BBK_DIFF="0.2"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="44.826" BBK_DIFF="-69.3"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="145.864" BBK_DIFF="16.2"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="125.568" BBK_DIFF="0.9"/>
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  </bbk:DataSet>
</CompactData>
