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      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="-136.167" BBK_DIFF="-13.0" BBK_DIFF_Y="12.9"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="-120.522" BBK_DIFF="13.9" BBK_DIFF_Y="16.8"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="-140.0" BBK_DIFF="2.8" BBK_DIFF_Y="-52.4"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="-144.087" BBK_DIFF="13.0" BBK_DIFF_Y="-0.6"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="-165.602" BBK_DIFF="-5.0" BBK_DIFF_Y="-6.1"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="-157.661" BBK_DIFF="-25.7"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="-125.471" BBK_DIFF="26.0"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="-169.479" BBK_DIFF="-64.1"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="-103.261" BBK_DIFF="18.7"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="-126.975" BBK_DIFF="0.9"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="-128.075" BBK_DIFF="3.5"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="-132.689" BBK_DIFF="15.2"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="-156.413" BBK_DIFF="-8.0"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="-144.875" BBK_DIFF="-57.7"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="-91.849" BBK_DIFF="35.8"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="-143.177" BBK_DIFF="8.3"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="-156.09"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
