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      <bbk:Obs TIME_PERIOD="1972-11" OBS_VALUE="184.261" BBK_DIFF="104.5" BBK_DIFF_Y="70.0"/>
      <bbk:Obs TIME_PERIOD="1972-10" OBS_VALUE="90.101" BBK_DIFF="-26.7" BBK_DIFF_Y="6.3"/>
      <bbk:Obs TIME_PERIOD="1972-09" OBS_VALUE="122.943" BBK_DIFF="36.7" BBK_DIFF_Y="59.4"/>
      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="89.94" BBK_DIFF="-27.6" BBK_DIFF_Y="28.4"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="124.206" BBK_DIFF="-11.0" BBK_DIFF_Y="13.9"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="139.48" BBK_DIFF="68.3" BBK_DIFF_Y="10.1"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="82.859" BBK_DIFF="-7.5" BBK_DIFF_Y="27.3"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="89.615" BBK_DIFF="-85.9" BBK_DIFF_Y="7.5"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="635.578" BBK_DIFF="388.8" BBK_DIFF_Y="326.2"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="130.018" BBK_DIFF="-34.9" BBK_DIFF_Y="0.2"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="199.785" BBK_DIFF="-3.8" BBK_DIFF_Y="51.6"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="207.619" BBK_DIFF="91.6"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="108.361" BBK_DIFF="27.9"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="84.727" BBK_DIFF="9.8"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="77.137" BBK_DIFF="10.1"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="70.073" BBK_DIFF="-35.7"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="109.025" BBK_DIFF="-13.9"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="126.641" BBK_DIFF="94.6"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="65.071" BBK_DIFF="-22.0"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="83.401" BBK_DIFF="-44.1"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="149.121" BBK_DIFF="14.9"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="129.788" BBK_DIFF="-1.5"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="131.758"/>
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  </bbk:DataSet>
</CompactData>
