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      <bbk:Obs TIME_PERIOD="1972-10" OBS_VALUE="10.002" BBK_DIFF="13.7" BBK_DIFF_Y="-24.7"/>
      <bbk:Obs TIME_PERIOD="1972-09" OBS_VALUE="8.8" BBK_DIFF="-48.6" BBK_DIFF_Y="8.0"/>
      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="17.111" BBK_DIFF="45.6" BBK_DIFF_Y="60.7"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="11.753" BBK_DIFF="20.9" BBK_DIFF_Y="-15.8"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="9.721" BBK_DIFF="-2.8" BBK_DIFF_Y="-5.1"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="9.998" BBK_DIFF="-26.5" BBK_DIFF_Y="-13.6"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="13.601" BBK_DIFF="56.1" BBK_DIFF_Y="4.2"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="8.712" BBK_DIFF="-26.3" BBK_DIFF_Y="-29.0"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="11.822" BBK_DIFF="-4.8" BBK_DIFF_Y="30.7"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="12.422" BBK_DIFF="-3.2" BBK_DIFF_Y="-19.4"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="12.838" BBK_DIFF="17.9"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="10.893" BBK_DIFF="-18.0"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="13.278" BBK_DIFF="62.9"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="8.151" BBK_DIFF="-23.4"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="10.645" BBK_DIFF="-23.7"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="13.958" BBK_DIFF="36.2"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="10.247" BBK_DIFF="-11.5"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="11.575" BBK_DIFF="-11.3"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="13.052" BBK_DIFF="6.4"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="12.267" BBK_DIFF="35.7"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="9.043" BBK_DIFF="-41.3"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="15.404"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
