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      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="176.54" BBK_DIFF="-28.0" BBK_DIFF_Y="-41.8"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="245.173" BBK_DIFF="5.6" BBK_DIFF_Y="-23.9"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="232.215" BBK_DIFF="3.3" BBK_DIFF_Y="-27.1"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="224.816" BBK_DIFF="-0.8" BBK_DIFF_Y="-28.1"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="226.623" BBK_DIFF="3.8" BBK_DIFF_Y="-40.1"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="218.265" BBK_DIFF="-5.3" BBK_DIFF_Y="-23.6"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="230.438" BBK_DIFF="2.8" BBK_DIFF_Y="-8.6"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="224.178" BBK_DIFF="5.5" BBK_DIFF_Y="-11.9"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="212.514" BBK_DIFF="-23.7"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="278.636" BBK_DIFF="-15.2"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="328.496" BBK_DIFF="25.8"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="261.172" BBK_DIFF="-13.8"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="303.08" BBK_DIFF="-5.9"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="322.189" BBK_DIFF="1.1"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="318.646" BBK_DIFF="1.9"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="312.853" BBK_DIFF="-17.3"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="378.214" BBK_DIFF="32.4"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="285.682" BBK_DIFF="13.3"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="252.04" BBK_DIFF="-0.9"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="254.438"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
