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      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="-28.955" BBK_DIFF="-2.2" BBK_DIFF_Y="-4.0"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="-28.34" BBK_DIFF="-730.4" BBK_DIFF_Y="-4.8"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="-3.413" BBK_DIFF="87.5" BBK_DIFF_Y="88.0"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="-27.242" BBK_DIFF="1.5" BBK_DIFF_Y="-1131.0"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="-27.648" BBK_DIFF="12.6" BBK_DIFF_Y="0.7"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="-31.621" BBK_DIFF="-13.7"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="-27.814" BBK_DIFF="-1.9"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="-27.285" BBK_DIFF="1.4"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="-27.684" BBK_DIFF="-866.6"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="-2.864" BBK_DIFF="89.7"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="-27.716" BBK_DIFF="7.9"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="-30.084" BBK_DIFF="-8.1"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="-27.832" BBK_DIFF="-2.9"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="-27.05" BBK_DIFF="5.0"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="-28.468" BBK_DIFF="-1186.4"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="-2.213" BBK_DIFF="92.0"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="-27.835"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
