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      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="-30.543" BBK_DIFF="24.6" BBK_DIFF_Y="9.0"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="-40.506" BBK_DIFF="17.9" BBK_DIFF_Y="-34.1"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="-49.33" BBK_DIFF="22.9" BBK_DIFF_Y="-140.3"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="-64.019" BBK_DIFF="-13.1" BBK_DIFF_Y="-80.0"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="-56.594" BBK_DIFF="-5.0" BBK_DIFF_Y="-28.4"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="-53.904" BBK_DIFF="4.3" BBK_DIFF_Y="-2.0"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="-56.305" BBK_DIFF="-33.9" BBK_DIFF_Y="-146.2"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="-42.035" BBK_DIFF="27.3"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="-57.852" BBK_DIFF="3.9"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="-60.218" BBK_DIFF="-32.4"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="-45.497" BBK_DIFF="37.0"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="-72.189" BBK_DIFF="-115.1"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="-33.559" BBK_DIFF="-11.1"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="-30.211" BBK_DIFF="-47.2"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="-20.526" BBK_DIFF="42.3"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="-35.563" BBK_DIFF="19.3"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="-44.07" BBK_DIFF="16.6"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="-52.827" BBK_DIFF="-131.0"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="-22.868"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
