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      <bbk:Obs TIME_PERIOD="1972-09" OBS_VALUE="247.261" BBK_DIFF="-29.6" BBK_DIFF_Y="34.0"/>
      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="351.378" BBK_DIFF="29.6" BBK_DIFF_Y="88.5"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="271.229" BBK_DIFF="-44.6" BBK_DIFF_Y="3.4"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="489.979" BBK_DIFF="656.1" BBK_DIFF_Y="210.1"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="-88.108" BBK_DIFF="-179.4" BBK_DIFF_Y="-157.7"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="111.025" BBK_DIFF="-21.7" BBK_DIFF_Y="24.8"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="141.743" BBK_DIFF="-34.2" BBK_DIFF_Y="-12.1"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="215.575" BBK_DIFF="85.4" BBK_DIFF_Y="15.9"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="116.277" BBK_DIFF="-86.4" BBK_DIFF_Y="-22.0"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="854.007" BBK_DIFF="344.1"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="192.296" BBK_DIFF="91.7"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="100.303" BBK_DIFF="-45.7"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="184.578" BBK_DIFF="-1.0"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="186.452" BBK_DIFF="-28.9"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="262.268" BBK_DIFF="66.0"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="158.028" BBK_DIFF="3.4"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="152.815" BBK_DIFF="71.7"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="88.979" BBK_DIFF="-44.8"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="161.28" BBK_DIFF="-13.3"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="185.996" BBK_DIFF="24.7"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="149.143"/>
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  </bbk:DataSet>
</CompactData>
