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      <bbk:Obs TIME_PERIOD="1972-10" OBS_VALUE="263.871" BBK_DIFF="-2.9" BBK_DIFF_Y="-2.8"/>
      <bbk:Obs TIME_PERIOD="1972-09" OBS_VALUE="271.878" BBK_DIFF="2.3" BBK_DIFF_Y="1.5"/>
      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="265.85" BBK_DIFF="-4.1" BBK_DIFF_Y="5.0"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="277.302" BBK_DIFF="1.0" BBK_DIFF_Y="-7.1"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="274.653" BBK_DIFF="-4.4" BBK_DIFF_Y="-1.8"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="287.256" BBK_DIFF="10.8" BBK_DIFF_Y="-3.7"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="259.181" BBK_DIFF="-4.1" BBK_DIFF_Y="-13.5"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="270.293" BBK_DIFF="-2.1" BBK_DIFF_Y="-6.6"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="276.103" BBK_DIFF="-6.3" BBK_DIFF_Y="-1.7"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="294.683" BBK_DIFF="-7.0" BBK_DIFF_Y="0.5"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="316.991" BBK_DIFF="11.5"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="284.209" BBK_DIFF="4.7"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="271.382" BBK_DIFF="1.4"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="267.752" BBK_DIFF="5.8"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="253.076" BBK_DIFF="-15.2"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="298.561" BBK_DIFF="6.7"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="279.772" BBK_DIFF="-6.2"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="298.178" BBK_DIFF="-0.5"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="299.574" BBK_DIFF="3.5"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="289.536" BBK_DIFF="3.1"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="280.787" BBK_DIFF="-4.3"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="293.316"/>
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  </bbk:DataSet>
</CompactData>
