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      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="-12.456" BBK_DIFF="-494.8" BBK_DIFF_Y="-187.4"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="-2.094" BBK_DIFF="72.9" BBK_DIFF_Y="80.6"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="-7.724" BBK_DIFF="-189.7" BBK_DIFF_Y="-108.9"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="8.612" BBK_DIFF="330.3" BBK_DIFF_Y="301.1"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="-3.739" BBK_DIFF="-29.4" BBK_DIFF_Y="-126.5"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="-2.89" BBK_DIFF="87.6" BBK_DIFF_Y="28.1"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="-23.38" BBK_DIFF="-490.3" BBK_DIFF_Y="-88.4"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="5.99" BBK_DIFF="506.4"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="-1.474" BBK_DIFF="86.3"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="-10.764" BBK_DIFF="-39.7"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="-7.706" BBK_DIFF="-7.8"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="-7.147" BBK_DIFF="-150.1"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="14.256" BBK_DIFF="231.8"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="-10.815" BBK_DIFF="-192.5"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="-3.697" BBK_DIFF="-272.2"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="2.147" BBK_DIFF="-84.8"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="14.091" BBK_DIFF="450.4"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="-4.021" BBK_DIFF="67.6"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="-12.408"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
