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      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="-5.141" BBK_DIFF="1.0" BBK_DIFF_Y="6.8"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="-5.192" BBK_DIFF="-20.2" BBK_DIFF_Y="-173.3"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="-4.321" BBK_DIFF="-31.4" BBK_DIFF_Y="-26.6"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="-3.289" BBK_DIFF="21.1" BBK_DIFF_Y="-5.5"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="-4.17" BBK_DIFF="-55.1" BBK_DIFF_Y="-141.0"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="-2.688" BBK_DIFF="47.5" BBK_DIFF_Y="-77.4"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="-5.124" BBK_DIFF="-25.1" BBK_DIFF_Y="-38.4"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="-4.097" BBK_DIFF="34.2"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="-6.224" BBK_DIFF="-144.9"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="-2.541" BBK_DIFF="27.9"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="-3.524" BBK_DIFF="-39.7"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="-2.522" BBK_DIFF="54.3"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="-5.514" BBK_DIFF="-190.2"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="-1.9" BBK_DIFF="44.3"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="-3.412" BBK_DIFF="-9.5"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="-3.117" BBK_DIFF="-80.2"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="-1.73" BBK_DIFF="-14.2"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="-1.515" BBK_DIFF="59.1"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="-3.703"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
