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      <bbk:Obs TIME_PERIOD="1972-11" OBS_VALUE="3.559" BBK_DIFF="-80.2" BBK_DIFF_Y="-41.2"/>
      <bbk:Obs TIME_PERIOD="1972-10" OBS_VALUE="17.978" BBK_DIFF="-26.6" BBK_DIFF_Y="317.1"/>
      <bbk:Obs TIME_PERIOD="1972-09" OBS_VALUE="24.494" BBK_DIFF="114.9" BBK_DIFF_Y="-22.0"/>
      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="11.398" BBK_DIFF="125.3" BBK_DIFF_Y="-38.6"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="5.059" BBK_DIFF="-88.2" BBK_DIFF_Y="-85.2"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="42.856" BBK_DIFF="36.2" BBK_DIFF_Y="-87.4"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="31.47" BBK_DIFF="-43.6" BBK_DIFF_Y="10.8"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="55.767" BBK_DIFF="90.3" BBK_DIFF_Y="823.3"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="29.307" BBK_DIFF="24.9" BBK_DIFF_Y="-16.7"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="23.466" BBK_DIFF="-79.2" BBK_DIFF_Y="70.5"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="112.635" BBK_DIFF="-26.8" BBK_DIFF_Y="37.3"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="153.951" BBK_DIFF="2443.8"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="6.052" BBK_DIFF="40.4"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="4.31" BBK_DIFF="-86.3"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="31.411" BBK_DIFF="69.2"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="18.56" BBK_DIFF="-45.8"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="34.243" BBK_DIFF="-89.9"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="340.099" BBK_DIFF="1097.1"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="28.41" BBK_DIFF="370.4"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="6.04" BBK_DIFF="-82.8"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="35.2" BBK_DIFF="155.7"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="13.764" BBK_DIFF="-83.2"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="82.045"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
