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      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="39.574" BBK_DIFF="17.5" BBK_DIFF_Y="56.8"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="33.681" BBK_DIFF="-19.7" BBK_DIFF_Y="14.1"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="41.92" BBK_DIFF="6.5" BBK_DIFF_Y="46.7"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="39.375" BBK_DIFF="18.4" BBK_DIFF_Y="32.1"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="33.252" BBK_DIFF="27.1" BBK_DIFF_Y="6.5"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="26.157" BBK_DIFF="-11.6"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="29.586" BBK_DIFF="-19.7"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="36.863" BBK_DIFF="11.0"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="33.216" BBK_DIFF="-7.3"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="35.818" BBK_DIFF="32.0"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="27.125" BBK_DIFF="11.4"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="24.355" BBK_DIFF="-3.5"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="25.238" BBK_DIFF="-14.5"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="29.531" BBK_DIFF="3.4"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="28.571" BBK_DIFF="-4.1"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="29.807" BBK_DIFF="-4.5"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="31.215"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
