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      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="34.28" BBK_DIFF="-0.7" BBK_DIFF_Y="-3.8"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="34.53" BBK_DIFF="0.0" BBK_DIFF_Y="-2.1"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="34.541" BBK_DIFF="0.3" BBK_DIFF_Y="-2.1"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="34.43" BBK_DIFF="-15.0" BBK_DIFF_Y="-3.4"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="40.502" BBK_DIFF="12.3" BBK_DIFF_Y="38.6"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="36.066" BBK_DIFF="-4.1"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="37.595" BBK_DIFF="1.1"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="37.196" BBK_DIFF="-0.7"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="37.459" BBK_DIFF="-5.0"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="39.415" BBK_DIFF="1.4"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="38.852" BBK_DIFF="8.9"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="35.667" BBK_DIFF="0.1"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="35.646" BBK_DIFF="1.0"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="35.285" BBK_DIFF="0.0"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="35.288" BBK_DIFF="-1.0"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="35.629" BBK_DIFF="21.9"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="29.226"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
