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      <bbk:Obs TIME_PERIOD="1972-10" OBS_VALUE="-4.639" BBK_DIFF="38.0" BBK_DIFF_Y="-5557.6"/>
      <bbk:Obs TIME_PERIOD="1972-09" OBS_VALUE="-7.478" BBK_DIFF="-84.8" BBK_DIFF_Y="-173.3"/>
      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="-4.047" BBK_DIFF="13.1" BBK_DIFF_Y="-34.0"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="-4.656" BBK_DIFF="-196.2" BBK_DIFF_Y="-192.7"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="4.839" BBK_DIFF="135.4" BBK_DIFF_Y="214.7"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="-13.664" BBK_DIFF="-250.4" BBK_DIFF_Y="-950.8"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="-3.899" BBK_DIFF="-11.7" BBK_DIFF_Y="-2.4"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="-3.491" BBK_DIFF="20.6" BBK_DIFF_Y="53.0"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="-4.398" BBK_DIFF="79.0" BBK_DIFF_Y="-134.8"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="-20.96" BBK_DIFF="-1389.7" BBK_DIFF_Y="-250.4"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="-1.407" BBK_DIFF="54.8"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="-3.115" BBK_DIFF="-3764.7"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="0.085" BBK_DIFF="103.1"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="-2.736" BBK_DIFF="9.4"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="-3.021" BBK_DIFF="-160.1"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="5.023" BBK_DIFF="219.0"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="-4.22" BBK_DIFF="-362.8"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="1.606" BBK_DIFF="142.2"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="-3.808" BBK_DIFF="48.7"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="-7.424" BBK_DIFF="-158.8"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="12.632" BBK_DIFF="311.2"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="-5.982"/>
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  </bbk:DataSet>
</CompactData>
