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      <bbk:Obs TIME_PERIOD="1972-11" OBS_VALUE="20.832" BBK_DIFF="-30.9" BBK_DIFF_Y="-50.3"/>
      <bbk:Obs TIME_PERIOD="1972-10" OBS_VALUE="30.148" BBK_DIFF="8.9" BBK_DIFF_Y="-5.2"/>
      <bbk:Obs TIME_PERIOD="1972-09" OBS_VALUE="27.692" BBK_DIFF="-83.5" BBK_DIFF_Y="-70.3"/>
      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="167.463" BBK_DIFF="74.9" BBK_DIFF_Y="230.9"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="95.748" BBK_DIFF="-16.0" BBK_DIFF_Y="319.0"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="113.946" BBK_DIFF="1602.0" BBK_DIFF_Y="321.1"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="6.695" BBK_DIFF="-72.8" BBK_DIFF_Y="-55.2"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="24.616" BBK_DIFF="-70.1" BBK_DIFF_Y="80.1"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="82.244" BBK_DIFF="585.1" BBK_DIFF_Y="-73.6"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="-16.954" BBK_DIFF="-123.1" BBK_DIFF_Y="-155.8"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="73.337" BBK_DIFF="307.1" BBK_DIFF_Y="-19.6"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="18.013" BBK_DIFF="-57.0"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="41.898" BBK_DIFF="31.7"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="31.818" BBK_DIFF="-65.9"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="93.22" BBK_DIFF="84.2"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="50.614" BBK_DIFF="121.5"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="22.852" BBK_DIFF="-15.5"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="27.058" BBK_DIFF="81.2"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="14.932" BBK_DIFF="9.2"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="13.67" BBK_DIFF="-95.6"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="312.054" BBK_DIFF="926.5"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="30.4" BBK_DIFF="-66.7"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="91.253"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
