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      <bbk:Obs TIME_PERIOD="1972-09" OBS_VALUE="357.331" BBK_DIFF="11.0" BBK_DIFF_Y="4.3"/>
      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="321.915" BBK_DIFF="2.9" BBK_DIFF_Y="-2.8"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="312.719" BBK_DIFF="-1.8" BBK_DIFF_Y="-8.3"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="318.466" BBK_DIFF="11.2" BBK_DIFF_Y="-6.4"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="286.428" BBK_DIFF="-2.3" BBK_DIFF_Y="-3.2"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="293.24" BBK_DIFF="1.5" BBK_DIFF_Y="-2.7"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="288.902" BBK_DIFF="0.6" BBK_DIFF_Y="-19.3"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="287.207" BBK_DIFF="-0.4" BBK_DIFF_Y="7.6"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="288.349" BBK_DIFF="-10.1" BBK_DIFF_Y="-0.3"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="320.723" BBK_DIFF="-0.9"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="323.524" BBK_DIFF="9.8"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="294.68" BBK_DIFF="-14.0"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="342.644" BBK_DIFF="3.5"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="331.091" BBK_DIFF="-2.9"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="340.948" BBK_DIFF="0.2"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="340.226" BBK_DIFF="14.9"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="296.022" BBK_DIFF="-1.8"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="301.498" BBK_DIFF="-15.8"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="358.057" BBK_DIFF="34.2"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="266.885" BBK_DIFF="-7.7"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="289.217"/>
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  </bbk:DataSet>
</CompactData>
