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      <bbk:Obs TIME_PERIOD="1972-09" OBS_VALUE="-0.624" BBK_DIFF="-25.6" BBK_DIFF_Y="-367.8"/>
      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="-0.497" BBK_DIFF="-126.1" BBK_DIFF_Y="-300.8"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="1.907" BBK_DIFF="68.0" BBK_DIFF_Y="273.8"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="1.135" BBK_DIFF="456.4" BBK_DIFF_Y="32.4"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="0.204" BBK_DIFF="149.4" BBK_DIFF_Y="133.0"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="-0.413" BBK_DIFF="-128.4" BBK_DIFF_Y="-429.5"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="1.454" BBK_DIFF="2038.2" BBK_DIFF_Y="53.4"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="0.068" BBK_DIFF="124.8" BBK_DIFF_Y="131.8"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="-0.274" BBK_DIFF="-212.3" BBK_DIFF_Y="41.7"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="0.244" BBK_DIFF="-96.7"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="7.288" BBK_DIFF="2809.3"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="-0.269" BBK_DIFF="-215.5"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="0.233" BBK_DIFF="287.9"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="-0.124" BBK_DIFF="88.7"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="-1.097" BBK_DIFF="-228.0"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="0.857" BBK_DIFF="238.4"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="-0.619" BBK_DIFF="-693.6"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="-0.078" BBK_DIFF="-108.2"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="0.948" BBK_DIFF="543.0"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="-0.214" BBK_DIFF="54.5"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="-0.47"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
