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      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="110.382" BBK_DIFF="228.0" BBK_DIFF_Y="133.7"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="-86.236" BBK_DIFF="-170.7" BBK_DIFF_Y="74.0"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="121.919" BBK_DIFF="369.9"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="-45.175" BBK_DIFF="-27.1"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="-35.543" BBK_DIFF="4.6"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="-37.271" BBK_DIFF="-230.5"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="28.562" BBK_DIFF="471.8"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="-7.683" BBK_DIFF="-104.5"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="169.6" BBK_DIFF="297.2"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="-86.009" BBK_DIFF="-474.6"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="-14.968" BBK_DIFF="-168.2"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="21.954" BBK_DIFF="-53.5"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="47.236" BBK_DIFF="114.2"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="-331.796"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
