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      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="-34.297" BBK_DIFF="41.6" BBK_DIFF_Y="-6.4"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="-58.763" BBK_DIFF="-133.3" BBK_DIFF_Y="-75.0"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="-25.183" BBK_DIFF="37.0" BBK_DIFF_Y="29.5"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="-39.968" BBK_DIFF="-14.9" BBK_DIFF_Y="-19.8"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="-34.79" BBK_DIFF="-151.7" BBK_DIFF_Y="-3.8"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="-13.824" BBK_DIFF="47.9"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="-26.527" BBK_DIFF="40.9"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="-44.875" BBK_DIFF="-72.6"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="-25.993" BBK_DIFF="12.4"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="-29.678" BBK_DIFF="-2.1"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="-29.081" BBK_DIFF="8.1"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="-31.653" BBK_DIFF="1.8"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="-32.226" BBK_DIFF="4.0"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="-33.57" BBK_DIFF="6.0"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="-35.707" BBK_DIFF="-7.0"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="-33.366" BBK_DIFF="0.5"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="-33.518"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
