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      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="6.927" BBK_DIFF="19.5" BBK_DIFF_Y="15.9"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="5.797" BBK_DIFF="-25.7" BBK_DIFF_Y="0.6"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="7.804" BBK_DIFF="17.7" BBK_DIFF_Y="38.0"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="6.633" BBK_DIFF="-44.5" BBK_DIFF_Y="12.3"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="11.951" BBK_DIFF="156.2" BBK_DIFF_Y="36.8"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="4.665" BBK_DIFF="-5.5"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="4.934" BBK_DIFF="51.0"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="3.267" BBK_DIFF="34.5"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="2.429" BBK_DIFF="-40.4"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="4.075" BBK_DIFF="-33.2"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="6.104" BBK_DIFF="13.2"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="5.39" BBK_DIFF="-9.9"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="5.979" BBK_DIFF="3.7"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="5.763" BBK_DIFF="1.9"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="5.654" BBK_DIFF="-4.3"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="5.905" BBK_DIFF="-32.4"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="8.738"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
