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      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="28.981" BBK_DIFF="-37.1" BBK_DIFF_Y="-25.4"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="46.098" BBK_DIFF="12.4" BBK_DIFF_Y="23.9"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="41.002" BBK_DIFF="120.6" BBK_DIFF_Y="7.5"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="18.584" BBK_DIFF="-45.4"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="34.058" BBK_DIFF="-32.5"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="50.479" BBK_DIFF="69.9"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="29.703" BBK_DIFF="-10.4"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="33.151" BBK_DIFF="-5.4"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="35.037" BBK_DIFF="1.1"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="34.659" BBK_DIFF="-6.0"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="36.877" BBK_DIFF="-4.3"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="38.532" BBK_DIFF="-0.9"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="38.869" BBK_DIFF="4.5"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="37.212" BBK_DIFF="-2.5"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="38.15"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
