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      <bbk:Obs TIME_PERIOD="1972-10" OBS_VALUE="117.543" BBK_DIFF="29.9" BBK_DIFF_Y="7.4"/>
      <bbk:Obs TIME_PERIOD="1972-09" OBS_VALUE="90.514" BBK_DIFF="8.1" BBK_DIFF_Y="10.8"/>
      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="83.734" BBK_DIFF="19.9" BBK_DIFF_Y="-1.4"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="69.855" BBK_DIFF="-3.5" BBK_DIFF_Y="-14.5"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="72.358" BBK_DIFF="4.8" BBK_DIFF_Y="-4.1"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="69.049" BBK_DIFF="-16.8" BBK_DIFF_Y="13.2"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="83.001" BBK_DIFF="21.9" BBK_DIFF_Y="13.0"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="68.114" BBK_DIFF="-18.4" BBK_DIFF_Y="-8.3"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="83.438" BBK_DIFF="4.0" BBK_DIFF_Y="24.1"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="80.266" BBK_DIFF="-7.9" BBK_DIFF_Y="29.7"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="87.143" BBK_DIFF="-11.0"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="97.961" BBK_DIFF="-10.5"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="109.419" BBK_DIFF="33.9"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="81.692" BBK_DIFF="-3.8"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="84.927" BBK_DIFF="3.9"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="81.736" BBK_DIFF="8.3"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="75.485" BBK_DIFF="23.8"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="60.982" BBK_DIFF="-17.0"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="73.431" BBK_DIFF="-1.1"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="74.26" BBK_DIFF="10.5"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="67.225" BBK_DIFF="8.7"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="61.866"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
