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      <bbk:Obs TIME_PERIOD="1972-09" OBS_VALUE="24.169" BBK_DIFF="-34.7" BBK_DIFF_Y="35.8"/>
      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="36.994" BBK_DIFF="41.1" BBK_DIFF_Y="-64.2"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="26.223" BBK_DIFF="-61.8" BBK_DIFF_Y="-78.3"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="68.682" BBK_DIFF="-21.7" BBK_DIFF_Y="-37.1"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="87.743" BBK_DIFF="539.2" BBK_DIFF_Y="201.0"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="-19.978" BBK_DIFF="-122.4" BBK_DIFF_Y="-129.9"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="89.006" BBK_DIFF="276.8" BBK_DIFF_Y="-62.1"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="23.619" BBK_DIFF="-61.2" BBK_DIFF_Y="-4.4"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="60.923" BBK_DIFF="-58.1" BBK_DIFF_Y="214.0"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="145.248" BBK_DIFF="101.1"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="72.237" BBK_DIFF="97.3"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="36.611" BBK_DIFF="105.6"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="17.804" BBK_DIFF="-82.8"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="103.341" BBK_DIFF="-14.4"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="120.756" BBK_DIFF="10.6"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="109.16" BBK_DIFF="274.5"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="29.152" BBK_DIFF="-56.3"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="66.772" BBK_DIFF="-71.6"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="234.992" BBK_DIFF="851.6"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="24.694" BBK_DIFF="146.2"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="-53.452"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
