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      <bbk:Obs TIME_PERIOD="1972-09" OBS_VALUE="-17.646" BBK_DIFF="-1588.6" BBK_DIFF_Y="-397.7"/>
      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="-1.045" BBK_DIFF="-115.9" BBK_DIFF_Y="95.1"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="6.586" BBK_DIFF="-93.6" BBK_DIFF_Y="-67.7"/>
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      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="128.825" BBK_DIFF="256.9" BBK_DIFF_Y="530.2"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="36.099" BBK_DIFF="308.4" BBK_DIFF_Y="-31.9"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="-17.32" BBK_DIFF="-162.4" BBK_DIFF_Y="-241.4"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="27.746" BBK_DIFF="146.5" BBK_DIFF_Y="-62.3"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="-59.661" BBK_DIFF="-198.5" BBK_DIFF_Y="-1587.2"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="60.599" BBK_DIFF="745.1"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="-9.394" BBK_DIFF="-108.7"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="108.59" BBK_DIFF="1731.8"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="5.928" BBK_DIFF="128.0"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="-21.157" BBK_DIFF="-203.9"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="20.362" BBK_DIFF="144.3"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="-45.951" BBK_DIFF="-324.8"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="20.442" BBK_DIFF="-61.5"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="53.047" BBK_DIFF="333.0"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="12.252" BBK_DIFF="-83.4"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="73.615" BBK_DIFF="2181.9"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="-3.536"/>
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  </bbk:DataSet>
</CompactData>
