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      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="-35.096" BBK_DIFF="-24.5" BBK_DIFF_Y="-8.6"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="-28.188" BBK_DIFF="-6.6" BBK_DIFF_Y="-813.1"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="-26.437" BBK_DIFF="-375.0" BBK_DIFF_Y="11.6"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="-5.566" BBK_DIFF="76.7" BBK_DIFF_Y="72.5"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="-23.894" BBK_DIFF="-8.5" BBK_DIFF_Y="-2746.1"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="-22.03" BBK_DIFF="-12.4" BBK_DIFF_Y="6.2"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="-19.595" BBK_DIFF="-617.6" BBK_DIFF_Y="24.9"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="3.786" BBK_DIFF="113.2"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="-28.689" BBK_DIFF="-16.2"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="-24.684" BBK_DIFF="-331.1"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="-5.726" BBK_DIFF="77.8"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="-25.765" BBK_DIFF="20.2"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="-32.305" BBK_DIFF="-946.5"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="-3.087" BBK_DIFF="89.7"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="-29.904" BBK_DIFF="-47.5"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="-20.274" BBK_DIFF="-2345.2"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="0.903" BBK_DIFF="103.8"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="-23.483" BBK_DIFF="10.0"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="-26.079"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
