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      <bbk:Obs TIME_PERIOD="1972-10" OBS_VALUE="-22.704" BBK_DIFF="97.6" BBK_DIFF_Y="-292.0"/>
      <bbk:Obs TIME_PERIOD="1972-09" OBS_VALUE="-945.113" BBK_DIFF="-199.6" BBK_DIFF_Y="-2324.7"/>
      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="949.362" BBK_DIFF="5470.4" BBK_DIFF_Y="2407.4"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="17.043" BBK_DIFF="156.8" BBK_DIFF_Y="315.6"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="-29.997" BBK_DIFF="-307.2" BBK_DIFF_Y="-7.1"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="14.474" BBK_DIFF="8.3" BBK_DIFF_Y="-63.9"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="13.363" BBK_DIFF="648.1" BBK_DIFF_Y="487.1"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="-2.438" BBK_DIFF="-125.5" BBK_DIFF_Y="-178.7"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="9.572" BBK_DIFF="347.1" BBK_DIFF_Y="364.9"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="-3.874" BBK_DIFF="-174.8" BBK_DIFF_Y="-128.0"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="5.177" BBK_DIFF="190.8"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="1.78" BBK_DIFF="-84.9"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="11.823" BBK_DIFF="130.3"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="-38.979" BBK_DIFF="-202.9"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="37.863" BBK_DIFF="578.9"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="-7.906" BBK_DIFF="71.8"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="-28.011" BBK_DIFF="-169.9"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="40.072" BBK_DIFF="1260.8"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="-3.452" BBK_DIFF="-211.4"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="3.098" BBK_DIFF="50.5"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="2.059" BBK_DIFF="-85.1"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="13.849"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
