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      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="9.121" BBK_DIFF="-27.0" BBK_DIFF_Y="-3.9"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="12.498" BBK_DIFF="-8.0" BBK_DIFF_Y="35.0"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="13.58" BBK_DIFF="65.2" BBK_DIFF_Y="18.7"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="8.219" BBK_DIFF="-22.8" BBK_DIFF_Y="-26.3"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="10.641" BBK_DIFF="-18.7" BBK_DIFF_Y="1.2"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="13.081" BBK_DIFF="35.7"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="9.64" BBK_DIFF="-11.0"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="10.836" BBK_DIFF="-14.9"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="12.738" BBK_DIFF="10.2"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="11.554" BBK_DIFF="0.1"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="11.543" BBK_DIFF="40.0"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="8.245" BBK_DIFF="-13.2"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="9.494" BBK_DIFF="2.5"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="9.258" BBK_DIFF="-19.0"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="11.436" BBK_DIFF="2.5"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="11.157" BBK_DIFF="6.1"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="10.515"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
