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      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="65.219" BBK_DIFF="32.4" BBK_DIFF_Y="45.6"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="49.256" BBK_DIFF="34.4" BBK_DIFF_Y="-10.7"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="36.64" BBK_DIFF="-7.4" BBK_DIFF_Y="-27.1"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="39.565" BBK_DIFF="23.2" BBK_DIFF_Y="-45.9"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="32.102" BBK_DIFF="-37.4" BBK_DIFF_Y="-39.6"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="51.304" BBK_DIFF="15.3"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="44.513" BBK_DIFF="10.7"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="40.193" BBK_DIFF="30.8"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="30.725" BBK_DIFF="-38.5"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="49.975" BBK_DIFF="-12.0"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="56.799" BBK_DIFF="-21.5"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="72.39" BBK_DIFF="61.6"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="44.806" BBK_DIFF="-18.7"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="55.14" BBK_DIFF="9.7"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="50.262" BBK_DIFF="-31.3"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="73.116" BBK_DIFF="37.6"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="53.152"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
