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      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="9.518" BBK_DIFF="-29.2" BBK_DIFF_Y="6.0"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="13.451" BBK_DIFF="41.8" BBK_DIFF_Y="66.1"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="9.484" BBK_DIFF="-11.0" BBK_DIFF_Y="-8.5"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="10.66" BBK_DIFF="-0.1" BBK_DIFF_Y="-1.4"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="10.673" BBK_DIFF="4.4" BBK_DIFF_Y="11.0"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="10.22" BBK_DIFF="3.5" BBK_DIFF_Y="-0.2"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="9.878" BBK_DIFF="-13.7"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="11.443" BBK_DIFF="-1.4"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="11.61" BBK_DIFF="15.5"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="10.056" BBK_DIFF="24.2"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="8.094" BBK_DIFF="-20.2"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="10.137" BBK_DIFF="12.9"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="8.98" BBK_DIFF="10.9"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="8.099" BBK_DIFF="-21.9"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="10.369" BBK_DIFF="-4.1"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="10.811" BBK_DIFF="12.4"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="9.618" BBK_DIFF="-6.0"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="10.237"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
