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      <bbk:Obs TIME_PERIOD="1973-01" OBS_VALUE="142.35" BBK_DIFF="8.7" BBK_DIFF_Y="36.6"/>
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      <bbk:Obs TIME_PERIOD="1972-11" OBS_VALUE="147.597" BBK_DIFF="-5.8" BBK_DIFF_Y="25.8"/>
      <bbk:Obs TIME_PERIOD="1972-10" OBS_VALUE="156.631" BBK_DIFF="7.8" BBK_DIFF_Y="41.0"/>
      <bbk:Obs TIME_PERIOD="1972-09" OBS_VALUE="145.324" BBK_DIFF="0.5" BBK_DIFF_Y="48.6"/>
      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="144.621" BBK_DIFF="46.2" BBK_DIFF_Y="43.7"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="98.925" BBK_DIFF="-3.6" BBK_DIFF_Y="-2.1"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="102.591" BBK_DIFF="-7.8" BBK_DIFF_Y="19.8"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="111.216" BBK_DIFF="-12.5" BBK_DIFF_Y="24.1"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="127.099" BBK_DIFF="16.1" BBK_DIFF_Y="19.6"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="109.499" BBK_DIFF="-10.3" BBK_DIFF_Y="20.3"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="122.063" BBK_DIFF="17.1" BBK_DIFF_Y="3.2"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="104.225" BBK_DIFF="-1.0" BBK_DIFF_Y="35.5"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="105.278" BBK_DIFF="-10.3"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="117.361" BBK_DIFF="5.7"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="111.057" BBK_DIFF="13.5"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="97.823" BBK_DIFF="-2.8"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="100.647" BBK_DIFF="-0.4"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="101.036" BBK_DIFF="18.0"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="85.6" BBK_DIFF="-4.5"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="89.62" BBK_DIFF="-15.6"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="106.245" BBK_DIFF="16.7"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="91.011" BBK_DIFF="-23.1"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="118.309" BBK_DIFF="53.8"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="76.91"/>
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  </bbk:DataSet>
</CompactData>
