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      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="49.443" BBK_DIFF="74.6" BBK_DIFF_Y="-1.1"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="28.319" BBK_DIFF="7.2" BBK_DIFF_Y="-0.9"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="26.408" BBK_DIFF="4.7" BBK_DIFF_Y="-29.1"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="25.232" BBK_DIFF="-12.1" BBK_DIFF_Y="16.3"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="28.721" BBK_DIFF="-52.7" BBK_DIFF_Y="-31.2"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="60.699" BBK_DIFF="62.5"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="37.344" BBK_DIFF="-10.5"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="41.736" BBK_DIFF="-15.7"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="49.488" BBK_DIFF="6.8"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="46.331" BBK_DIFF="-13.3"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="53.416" BBK_DIFF="70.3"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="31.365" BBK_DIFF="-37.3"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="50.016" BBK_DIFF="75.0"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="28.582" BBK_DIFF="-23.3"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="37.271" BBK_DIFF="71.8"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="21.7" BBK_DIFF="-48.1"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="41.771"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
