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      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="0.854" BBK_DIFF="-17.7" BBK_DIFF_Y="-11.2"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="1.038" BBK_DIFF="-26.2" BBK_DIFF_Y="-31.5"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="1.406" BBK_DIFF="26.3" BBK_DIFF_Y="4.5"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="1.113" BBK_DIFF="-6.7" BBK_DIFF_Y="72.8"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="1.193" BBK_DIFF="-46.4" BBK_DIFF_Y="4.3"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="2.225" BBK_DIFF="180.6" BBK_DIFF_Y="19.6"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="0.793" BBK_DIFF="-0.1"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="0.794" BBK_DIFF="-37.5"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="1.271" BBK_DIFF="37.3"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="0.926" BBK_DIFF="-27.5"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="1.278" BBK_DIFF="13.7"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="1.124" BBK_DIFF="16.8"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="0.962" BBK_DIFF="-36.5"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="1.515" BBK_DIFF="12.6"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="1.345" BBK_DIFF="108.9"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="0.644" BBK_DIFF="-43.7"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="1.144" BBK_DIFF="-38.5"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="1.86"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
