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      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="360.298" BBK_DIFF="1.0" BBK_DIFF_Y="-5.3"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="356.626" BBK_DIFF="-0.9" BBK_DIFF_Y="-1.4"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="360.031" BBK_DIFF="-4.6" BBK_DIFF_Y="-5.8"/>
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      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="332.899" BBK_DIFF="-15.0" BBK_DIFF_Y="5.4"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="391.689" BBK_DIFF="6.8"/>
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      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="343.082" BBK_DIFF="8.6"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="315.979"/>
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  </bbk:DataSet>
</CompactData>
