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      <bbk:Obs TIME_PERIOD="1972-09" OBS_VALUE="-357.943" BBK_DIFF="4.4" BBK_DIFF_Y="-26.0"/>
      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="-374.258" BBK_DIFF="-2.7" BBK_DIFF_Y="-10.4"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="-364.333" BBK_DIFF="-18.9" BBK_DIFF_Y="0.8"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="-306.452" BBK_DIFF="4.7" BBK_DIFF_Y="0.4"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="-321.686" BBK_DIFF="-16.2" BBK_DIFF_Y="-14.9"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="-276.924" BBK_DIFF="9.6" BBK_DIFF_Y="-0.6"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="-306.339" BBK_DIFF="-24.3" BBK_DIFF_Y="-8.5"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="-246.522" BBK_DIFF="7.2" BBK_DIFF_Y="-9.1"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="-265.513" BBK_DIFF="18.0" BBK_DIFF_Y="-11.3"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="-323.722" BBK_DIFF="-14.1"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="-283.683" BBK_DIFF="7.1"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="-305.375" BBK_DIFF="-7.5"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="-284.026" BBK_DIFF="16.2"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="-339.055" BBK_DIFF="7.7"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="-367.345" BBK_DIFF="-19.4"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="-307.662" BBK_DIFF="-9.9"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="-280.07" BBK_DIFF="-1.7"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="-275.317" BBK_DIFF="2.4"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="-282.229" BBK_DIFF="-25.0"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="-225.86" BBK_DIFF="5.3"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="-238.579"/>
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  </bbk:DataSet>
</CompactData>
