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      <bbk:Obs TIME_PERIOD="1972-10" OBS_VALUE="-12.787" BBK_DIFF="-177.3" BBK_DIFF_Y="-267.8"/>
      <bbk:Obs TIME_PERIOD="1972-09" OBS_VALUE="16.545" BBK_DIFF="176.4" BBK_DIFF_Y="328.1"/>
      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="-21.65" BBK_DIFF="-7.4" BBK_DIFF_Y="-230.5"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="-20.164" BBK_DIFF="-312.0" BBK_DIFF_Y="10.7"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="9.513" BBK_DIFF="159.7" BBK_DIFF_Y="301.5"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="-15.923" BBK_DIFF="33.3" BBK_DIFF_Y="18.4"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="-23.868" BBK_DIFF="-13696.5" BBK_DIFF_Y="-227.6"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="-0.173" BBK_DIFF="99.4" BBK_DIFF_Y="-101.7"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="-31.446" BBK_DIFF="-230.4" BBK_DIFF_Y="-144.6"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="-9.518" BBK_DIFF="21.6" BBK_DIFF_Y="-250.1"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="-12.135" BBK_DIFF="-2115.8"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="0.602" BBK_DIFF="-92.1"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="7.62" BBK_DIFF="205.1"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="-7.252" BBK_DIFF="-10.7"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="-6.55" BBK_DIFF="71.0"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="-22.573" BBK_DIFF="-378.2"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="-4.72" BBK_DIFF="75.8"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="-19.502" BBK_DIFF="-204.2"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="18.707" BBK_DIFF="81.1"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="10.332" BBK_DIFF="-85.3"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="70.506" BBK_DIFF="1011.7"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="6.342"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
