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      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="926.733" BBK_DIFF="-6.6" BBK_DIFF_Y="1.4"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="992.445" BBK_DIFF="22.9" BBK_DIFF_Y="-3.8"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="807.199" BBK_DIFF="-1.6" BBK_DIFF_Y="-2.9"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="820.086" BBK_DIFF="-26.2" BBK_DIFF_Y="-4.6"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="1110.999" BBK_DIFF="20.8"/>
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      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="1175.395" BBK_DIFF="13.3"/>
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      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="930.537" BBK_DIFF="1.8"/>
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      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="1031.181" BBK_DIFF="24.1"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="831.154" BBK_DIFF="-3.3"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="859.629"/>
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  </bbk:DataSet>
</CompactData>
