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      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="-156.736" BBK_DIFF="44.3" BBK_DIFF_Y="1.7"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="-281.267" BBK_DIFF="-41.5" BBK_DIFF_Y="-56.4"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="-198.774" BBK_DIFF="-5.4" BBK_DIFF_Y="38.9"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="-188.503" BBK_DIFF="-426.0" BBK_DIFF_Y="-7.0"/>
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      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="-192.51" BBK_DIFF="7.9"/>
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      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="-159.479" BBK_DIFF="11.3"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="-179.81" BBK_DIFF="44.7"/>
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  </bbk:DataSet>
</CompactData>
