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      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="12.583" BBK_DIFF="395.8" BBK_DIFF_Y="58.8"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="2.538" BBK_DIFF="0.1" BBK_DIFF_Y="-73.4"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="2.535" BBK_DIFF="0.0" BBK_DIFF_Y="-73.4"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="2.535" BBK_DIFF="-76.1" BBK_DIFF_Y="-73.4"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="10.603" BBK_DIFF="0.0" BBK_DIFF_Y="79.4"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="10.6" BBK_DIFF="0.0" BBK_DIFF_Y="79.4"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="10.601" BBK_DIFF="-7.1" BBK_DIFF_Y="79.4"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="11.413" BBK_DIFF="0.1"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="11.407" BBK_DIFF="0.0"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="11.407" BBK_DIFF="44.1"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="7.915" BBK_DIFF="-0.1"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="7.923" BBK_DIFF="0.0"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="7.924" BBK_DIFF="-16.9"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="9.533" BBK_DIFF="0.0"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="9.533" BBK_DIFF="0.0"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="9.533" BBK_DIFF="61.3"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="5.91" BBK_DIFF="0.0"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="5.908" BBK_DIFF="0.0"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="5.909"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
