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      <bbk:Obs TIME_PERIOD="1972-10" OBS_VALUE="39.211" BBK_DIFF="134.9" BBK_DIFF_Y="49.5"/>
      <bbk:Obs TIME_PERIOD="1972-09" OBS_VALUE="16.695" BBK_DIFF="-52.8" BBK_DIFF_Y="-4.5"/>
      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="35.391" BBK_DIFF="2.1" BBK_DIFF_Y="20.7"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="34.648" BBK_DIFF="127.3" BBK_DIFF_Y="-1.0"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="15.244" BBK_DIFF="-65.4" BBK_DIFF_Y="-18.6"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="44.04" BBK_DIFF="23.8" BBK_DIFF_Y="9.1"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="35.572" BBK_DIFF="17.2" BBK_DIFF_Y="11.1"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="30.361" BBK_DIFF="-4.1" BBK_DIFF_Y="25.5"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="31.673" BBK_DIFF="8.6" BBK_DIFF_Y="27.4"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="29.163" BBK_DIFF="27.9" BBK_DIFF_Y="52.1"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="22.8" BBK_DIFF="0.9"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="22.607" BBK_DIFF="-13.8"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="26.222" BBK_DIFF="50.1"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="17.473" BBK_DIFF="-40.4"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="29.317" BBK_DIFF="-16.3"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="35.014" BBK_DIFF="87.0"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="18.72" BBK_DIFF="-53.6"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="40.368" BBK_DIFF="26.1"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="32.022" BBK_DIFF="32.4"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="24.191" BBK_DIFF="-2.7"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="24.868" BBK_DIFF="29.7"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="19.171"/>
    </bbk:Series>
  </bbk:DataSet>
</CompactData>
