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      <bbk:Obs TIME_PERIOD="1972-09" OBS_VALUE="13.093" BBK_DIFF="-71.2" BBK_DIFF_Y="-51.3"/>
      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="45.516" BBK_DIFF="155.7" BBK_DIFF_Y="408.3"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="17.804" BBK_DIFF="300.9" BBK_DIFF_Y="-60.0"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="-8.861" BBK_DIFF="-155.0" BBK_DIFF_Y="-132.4"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="16.101" BBK_DIFF="-55.2" BBK_DIFF_Y="141.3"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="35.913" BBK_DIFF="27525.4" BBK_DIFF_Y="11.5"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="0.13" BBK_DIFF="-99.7" BBK_DIFF_Y="-99.5"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="42.04" BBK_DIFF="10.9" BBK_DIFF_Y="320.4"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="37.905" BBK_DIFF="129.6" BBK_DIFF_Y="-11.6"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="-128.144" BBK_DIFF="-2354.1"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="5.685" BBK_DIFF="-51.3"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="11.685" BBK_DIFF="-56.6"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="26.898" BBK_DIFF="200.4"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="8.955" BBK_DIFF="-79.9"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="44.525" BBK_DIFF="62.6"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="27.381" BBK_DIFF="170.2"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="-39.01" BBK_DIFF="-221.1"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="32.208" BBK_DIFF="26.1"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="25.535" BBK_DIFF="233.9"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="-19.077" BBK_DIFF="-144.5"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="42.878"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
