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      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="-29.208" BBK_DIFF="-225.1" BBK_DIFF_Y="-128.7"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="23.351" BBK_DIFF="180.1" BBK_DIFF_Y="152.4"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="8.338" BBK_DIFF="161.0" BBK_DIFF_Y="4.9"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="-13.672" BBK_DIFF="-1687.9" BBK_DIFF_Y="-204.4"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="0.861" BBK_DIFF="124.1" BBK_DIFF_Y="131.8"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="-3.567" BBK_DIFF="-181.8" BBK_DIFF_Y="-104.9"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="4.359" BBK_DIFF="-69.3" BBK_DIFF_Y="376.9"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="14.205" BBK_DIFF="-80.9" BBK_DIFF_Y="-20.6"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="74.564" BBK_DIFF="400.2"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="14.908" BBK_DIFF="-46.8"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="28.0" BBK_DIFF="494.9"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="-7.09" BBK_DIFF="44.5"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="-12.77" BBK_DIFF="71.3"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="-44.531" BBK_DIFF="-660.2"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="7.949" BBK_DIFF="-39.3"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="13.097" BBK_DIFF="583.6"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="-2.708" BBK_DIFF="-103.7"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="72.584" BBK_DIFF="7841.4"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="0.914" BBK_DIFF="-94.9"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="17.901"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
