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      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="6.449" BBK_DIFF="206.6" BBK_DIFF_Y="664.7"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="-6.048" BBK_DIFF="-246.7" BBK_DIFF_Y="-41.6"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="4.123" BBK_DIFF="546.2" BBK_DIFF_Y="239.1"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="0.638" BBK_DIFF="114.9" BBK_DIFF_Y="-34.6"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="-4.278" BBK_DIFF="-132.0" BBK_DIFF_Y="46.1"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="-1.844" BBK_DIFF="-1.9" BBK_DIFF_Y="-142.5"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="-1.81" BBK_DIFF="-143.2" BBK_DIFF_Y="73.5"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="4.185" BBK_DIFF="546.8" BBK_DIFF_Y="254.3"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="0.647" BBK_DIFF="180.4"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="-0.805" BBK_DIFF="-116.8"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="4.779" BBK_DIFF="355.4"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="-1.871" BBK_DIFF="-63.8"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="-1.142" BBK_DIFF="73.3"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="-4.272" BBK_DIFF="-451.3"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="1.216" BBK_DIFF="24.6"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="0.976" BBK_DIFF="112.3"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="-7.934" BBK_DIFF="-282.9"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="4.339" BBK_DIFF="163.5"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="-6.828" BBK_DIFF="-151.7"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="-2.713"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
