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      <bbk:Obs TIME_PERIOD="1972-09" OBS_VALUE="11.801" BBK_DIFF="-36.9" BBK_DIFF_Y="138.1"/>
      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="18.69" BBK_DIFF="241.8" BBK_DIFF_Y="7.2"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="-13.179" BBK_DIFF="-91.8" BBK_DIFF_Y="47.6"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="-6.872" BBK_DIFF="-168.3" BBK_DIFF_Y="-117.7"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="10.065" BBK_DIFF="535.4" BBK_DIFF_Y="137.5"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="1.584" BBK_DIFF="107.5" BBK_DIFF_Y="-81.7"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="-21.122" BBK_DIFF="-319.3" BBK_DIFF_Y="-250.3"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="9.63" BBK_DIFF="-72.1" BBK_DIFF_Y="184.0"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="34.55" BBK_DIFF="695.0" BBK_DIFF_Y="70.3"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="4.346" BBK_DIFF="15.0"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="3.779" BBK_DIFF="73.5"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="2.178" BBK_DIFF="107.0"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="-31.006" BBK_DIFF="-277.8"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="17.438" BBK_DIFF="169.3"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="-25.167" BBK_DIFF="-164.8"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="38.836" BBK_DIFF="244.7"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="-26.841" BBK_DIFF="-409.9"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="8.662" BBK_DIFF="243.6"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="-6.03" BBK_DIFF="47.4"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="-11.458" BBK_DIFF="-156.5"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="20.287"/>
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  </bbk:DataSet>
</CompactData>
