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      <bbk:Obs TIME_PERIOD="1972-09" OBS_VALUE="-0.637" BBK_DIFF="-117.4" BBK_DIFF_Y="-188.3"/>
      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="3.661" BBK_DIFF="196.4" BBK_DIFF_Y="643.2"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="-3.799" BBK_DIFF="-200.6" BBK_DIFF_Y="-899.8"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="-1.264" BBK_DIFF="-183.1" BBK_DIFF_Y="-184.1"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="1.521" BBK_DIFF="-13.0" BBK_DIFF_Y="50600.0"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="1.749" BBK_DIFF="57.6" BBK_DIFF_Y="84.1"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="1.11" BBK_DIFF="-18.7" BBK_DIFF_Y="145.5"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="1.365" BBK_DIFF="340.7" BBK_DIFF_Y="8431.3"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="-0.567" BBK_DIFF="64.7" BBK_DIFF_Y="-108.9"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="-1.605" BBK_DIFF="2.6"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="-1.647" BBK_DIFF="-175.6"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="2.179" BBK_DIFF="202.2"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="0.721" BBK_DIFF="207.0"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="-0.674" BBK_DIFF="-241.9"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="0.475" BBK_DIFF="-68.4"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="1.503" BBK_DIFF="50000.0"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="0.003" BBK_DIFF="-99.7"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="0.95" BBK_DIFF="138.9"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="-2.44" BBK_DIFF="-15350.0"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="0.016" BBK_DIFF="-99.7"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="6.385"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
