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      <bbk:Obs TIME_PERIOD="1972-09" OBS_VALUE="-143.162" BBK_DIFF="-200.0" BBK_DIFF_Y="-184.8"/>
      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="143.162" BBK_DIFF="7.7" BBK_DIFF_Y="-6.7"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="132.936" BBK_DIFF="-73.5" BBK_DIFF_Y="-25.7"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="501.066" BBK_DIFF="2550.0" BBK_DIFF_Y="188.2"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="-20.452" BBK_DIFF="-136.4" BBK_DIFF_Y="-112.5"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="56.242" BBK_DIFF="-77.1" BBK_DIFF_Y="-68.6"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="245.42" BBK_DIFF="-38.5" BBK_DIFF_Y="33.3"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="398.808" BBK_DIFF="809.1" BBK_DIFF_Y="143.8"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="-56.242" BBK_DIFF="-129.7" BBK_DIFF_Y="-137.9"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="189.178" BBK_DIFF="15.6"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="163.613" BBK_DIFF="-8.6"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="178.952" BBK_DIFF="6.1"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="168.726" BBK_DIFF="10.0"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="153.388" BBK_DIFF="-14.3"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="178.952" BBK_DIFF="2.9"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="173.839" BBK_DIFF="6.3"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="163.613" BBK_DIFF="-8.6"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="178.952" BBK_DIFF="-2.8"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="184.065" BBK_DIFF="12.5"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="163.613" BBK_DIFF="10.3"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="148.275"/>
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  </bbk:DataSet>
</CompactData>
