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      <bbk:Obs TIME_PERIOD="1972-09" OBS_VALUE="-37.81" BBK_DIFF="17.6" BBK_DIFF_Y="18.6"/>
      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="-45.865" BBK_DIFF="-23.0" BBK_DIFF_Y="28.8"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="-37.295" BBK_DIFF="20.7" BBK_DIFF_Y="29.5"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="-47.028" BBK_DIFF="-7.3" BBK_DIFF_Y="37.1"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="-43.848" BBK_DIFF="2.1" BBK_DIFF_Y="30.6"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="-44.796" BBK_DIFF="-13.1" BBK_DIFF_Y="24.8"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="-39.6" BBK_DIFF="-6.1" BBK_DIFF_Y="43.1"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="-37.317" BBK_DIFF="35.0" BBK_DIFF_Y="11.0"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="-57.385" BBK_DIFF="-12.1" BBK_DIFF_Y="23.0"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="-51.205" BBK_DIFF="-16.1"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="-44.115" BBK_DIFF="24.2"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="-58.232" BBK_DIFF="-25.3"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="-46.456" BBK_DIFF="27.9"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="-64.435" BBK_DIFF="-21.8"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="-52.903" BBK_DIFF="29.2"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="-74.751" BBK_DIFF="-18.4"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="-63.148" BBK_DIFF="-6.0"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="-59.554" BBK_DIFF="14.4"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="-69.56" BBK_DIFF="-65.9"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="-41.922" BBK_DIFF="43.8"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="-74.562"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
