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      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="-23.723" BBK_DIFF="-550.1" BBK_DIFF_Y="-500.3"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="-3.649" BBK_DIFF="-322.8" BBK_DIFF_Y="-191.0"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="1.638" BBK_DIFF="1170.6" BBK_DIFF_Y="175.7"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="-0.153" BBK_DIFF="-107.3" BBK_DIFF_Y="-104.5"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="2.092" BBK_DIFF="318.4" BBK_DIFF_Y="-68.8"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="-0.958" BBK_DIFF="86.5" BBK_DIFF_Y="83.0"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="-7.075" BBK_DIFF="-1146.6" BBK_DIFF_Y="-100.7"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="0.676" BBK_DIFF="112.9"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="-5.242" BBK_DIFF="44.8"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="-9.499" BBK_DIFF="-300.7"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="4.733" BBK_DIFF="140.0"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="-11.843" BBK_DIFF="-199.7"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="-3.952" BBK_DIFF="-198.5"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="4.012" BBK_DIFF="285.4"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="-2.164" BBK_DIFF="-163.3"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="3.42" BBK_DIFF="-48.9"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="6.699" BBK_DIFF="218.8"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="-5.639" BBK_DIFF="-59.9"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="-3.526"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
