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      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="0.198" BBK_DIFF="-3.4" BBK_DIFF_Y="-29.0"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="0.205" BBK_DIFF="1.5" BBK_DIFF_Y="-23.8"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="0.202" BBK_DIFF="14.8" BBK_DIFF_Y="-24.9"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="0.176" BBK_DIFF="-28.7" BBK_DIFF_Y="-39.9"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="0.247" BBK_DIFF="-4.6"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="0.259" BBK_DIFF="-0.4"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="0.26" BBK_DIFF="0.0"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="0.26" BBK_DIFF="0.0"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="0.26" BBK_DIFF="-0.4"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="0.261" BBK_DIFF="-0.8"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="0.263" BBK_DIFF="-1.5"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="0.267" BBK_DIFF="-4.3"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="0.279" BBK_DIFF="3.7"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="0.269" BBK_DIFF="0.0"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="0.269" BBK_DIFF="-8.2"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="0.293"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
