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      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="694.551" BBK_DIFF="8.3" BBK_DIFF_Y="-5.9"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="641.226" BBK_DIFF="-25.5" BBK_DIFF_Y="-29.3"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="860.35" BBK_DIFF="-14.9" BBK_DIFF_Y="1.9"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="1011.375" BBK_DIFF="-2.1" BBK_DIFF_Y="-8.1"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="1032.564" BBK_DIFF="44.0" BBK_DIFF_Y="14.7"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="716.819" BBK_DIFF="-14.5" BBK_DIFF_Y="-3.7"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="838.319" BBK_DIFF="34.4"/>
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      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="939.101" BBK_DIFF="7.2"/>
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      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="844.451" BBK_DIFF="-23.3"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="1101.09" BBK_DIFF="22.3"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="900.564" BBK_DIFF="20.9"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="744.619"/>
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  </bbk:DataSet>
</CompactData>
