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      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="16.306" BBK_DIFF="-77.1" BBK_DIFF_Y="-24.0"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="71.267" BBK_DIFF="163.5" BBK_DIFF_Y="247.5"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="27.045" BBK_DIFF="-7.5" BBK_DIFF_Y="-44.9"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="29.233" BBK_DIFF="740.8" BBK_DIFF_Y="128.8"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="3.477" BBK_DIFF="-35.4" BBK_DIFF_Y="-90.2"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="5.382" BBK_DIFF="-38.5" BBK_DIFF_Y="-51.5"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="8.75" BBK_DIFF="-53.2" BBK_DIFF_Y="-33.1"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="18.694" BBK_DIFF="-27.9" BBK_DIFF_Y="49.2"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="25.936" BBK_DIFF="110.2"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="12.341" BBK_DIFF="710.3"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="1.523" BBK_DIFF="-95.3"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="32.683" BBK_DIFF="52.2"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="21.467" BBK_DIFF="4.7"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="20.509" BBK_DIFF="-58.2"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="49.115" BBK_DIFF="284.5"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="12.775" BBK_DIFF="-63.8"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="35.309" BBK_DIFF="218.0"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="11.105" BBK_DIFF="-15.1"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="13.086" BBK_DIFF="4.4"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="12.529"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
