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      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="-0.626" BBK_DIFF="97.6" BBK_DIFF_Y="-39.4"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="-25.848" BBK_DIFF="-3701.2" BBK_DIFF_Y="-4310.9"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="-0.68" BBK_DIFF="97.4" BBK_DIFF_Y="-139.4"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="-26.06" BBK_DIFF="-5717.0" BBK_DIFF_Y="-5386.3"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="-0.448" BBK_DIFF="-11.2" BBK_DIFF_Y="98.3"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="-0.403" BBK_DIFF="-25.5" BBK_DIFF_Y="-315.5"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="-0.321" BBK_DIFF="24.5"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="-0.425" BBK_DIFF="98.4"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="-25.989" BBK_DIFF="-6317.0"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="-0.405" BBK_DIFF="-19.1"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="-0.34" BBK_DIFF="98.7"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="-26.217" BBK_DIFF="-5739.0"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="-0.449" BBK_DIFF="23.4"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="-0.586" BBK_DIFF="-106.3"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="-0.284" BBK_DIFF="40.2"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="-0.475" BBK_DIFF="98.2"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="-25.983" BBK_DIFF="-26686.6"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="-0.097"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
