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      <bbk:Obs TIME_PERIOD="1972-12" OBS_VALUE="40.862" BBK_DIFF="-0.2" BBK_DIFF_Y="-14.4"/>
      <bbk:Obs TIME_PERIOD="1972-11" OBS_VALUE="40.931" BBK_DIFF="-0.9" BBK_DIFF_Y="-14.8"/>
      <bbk:Obs TIME_PERIOD="1972-10" OBS_VALUE="41.297" BBK_DIFF="1.3" BBK_DIFF_Y="-12.5"/>
      <bbk:Obs TIME_PERIOD="1972-09" OBS_VALUE="40.768" BBK_DIFF="-1.5" BBK_DIFF_Y="-13.1"/>
      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="41.382" BBK_DIFF="34.9" BBK_DIFF_Y="-8.5"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="30.665" BBK_DIFF="-26.0" BBK_DIFF_Y="-31.1"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="41.423" BBK_DIFF="0.8" BBK_DIFF_Y="-15.6"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="41.11" BBK_DIFF="-3.5" BBK_DIFF_Y="-16.2"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="42.595" BBK_DIFF="1.6" BBK_DIFF_Y="-9.9"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="41.92" BBK_DIFF="-3.7" BBK_DIFF_Y="-11.4"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="43.517" BBK_DIFF="-0.8" BBK_DIFF_Y="-4.1"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="43.869" BBK_DIFF="-8.1" BBK_DIFF_Y="-1.4"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="47.742" BBK_DIFF="-0.6"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="48.027" BBK_DIFF="1.8"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="47.177" BBK_DIFF="0.6"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="46.901" BBK_DIFF="3.7"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="45.246" BBK_DIFF="1.7"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="44.506" BBK_DIFF="-9.3"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="49.071" BBK_DIFF="0.0"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="49.055" BBK_DIFF="3.8"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="47.261" BBK_DIFF="-0.1"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="47.3" BBK_DIFF="4.2"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="45.378" BBK_DIFF="1.9"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="44.513"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
