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      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="-42.166" BBK_DIFF="4.4" BBK_DIFF_Y="-416.7"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="-44.111" BBK_DIFF="-168.1" BBK_DIFF_Y="-217.1"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="-16.452" BBK_DIFF="-146.3" BBK_DIFF_Y="-152.1"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="-6.681" BBK_DIFF="-123.0" BBK_DIFF_Y="81.8"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="29.076" BBK_DIFF="-0.2" BBK_DIFF_Y="-30.1"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="29.141" BBK_DIFF="680.6" BBK_DIFF_Y="99.7"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="-5.019" BBK_DIFF="-136.6" BBK_DIFF_Y="71.4"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="13.708" BBK_DIFF="165.1"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="-21.053" BBK_DIFF="-36.9"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="-15.377" BBK_DIFF="-881.9"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="-1.566" BBK_DIFF="-101.6"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="97.432" BBK_DIFF="631.8"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="13.314" BBK_DIFF="-64.7"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="37.675" BBK_DIFF="19.4"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="31.556" BBK_DIFF="186.0"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="-36.7" BBK_DIFF="-188.2"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="41.59" BBK_DIFF="185.0"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="14.595" BBK_DIFF="183.2"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="-17.549"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
