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      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="184.568" BBK_DIFF="-14.3" BBK_DIFF_Y="1.4"/>
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      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="220.826" BBK_DIFF="7.6" BBK_DIFF_Y="14.9"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="205.15" BBK_DIFF="9.1" BBK_DIFF_Y="-2.1"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="188.075" BBK_DIFF="-4.7" BBK_DIFF_Y="-1.0"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="197.437" BBK_DIFF="-4.7" BBK_DIFF_Y="-11.1"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="207.07" BBK_DIFF="8.4" BBK_DIFF_Y="22.0"/>
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      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="181.973" BBK_DIFF="-33.7"/>
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      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="177.898" BBK_DIFF="-7.5"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="192.255" BBK_DIFF="-8.2"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="209.504" BBK_DIFF="10.3"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="189.916" BBK_DIFF="-14.5"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="222.024" BBK_DIFF="30.8"/>
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  </bbk:DataSet>
</CompactData>
