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      <bbk:Obs TIME_PERIOD="1973-03" OBS_VALUE="1504.918" BBK_DIFF="18.8" BBK_DIFF_Y="3.5"/>
      <bbk:Obs TIME_PERIOD="1973-02" OBS_VALUE="1267.156" BBK_DIFF="-13.3" BBK_DIFF_Y="7.4"/>
      <bbk:Obs TIME_PERIOD="1973-01" OBS_VALUE="1461.389" BBK_DIFF="-14.8" BBK_DIFF_Y="15.9"/>
      <bbk:Obs TIME_PERIOD="1972-12" OBS_VALUE="1714.993" BBK_DIFF="23.0" BBK_DIFF_Y="17.9"/>
      <bbk:Obs TIME_PERIOD="1972-11" OBS_VALUE="1394.375" BBK_DIFF="-0.8" BBK_DIFF_Y="19.6"/>
      <bbk:Obs TIME_PERIOD="1972-10" OBS_VALUE="1405.876" BBK_DIFF="-18.9" BBK_DIFF_Y="1.8"/>
      <bbk:Obs TIME_PERIOD="1972-09" OBS_VALUE="1734.246" BBK_DIFF="-12.7" BBK_DIFF_Y="9.0"/>
      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="1987.58" BBK_DIFF="8.4" BBK_DIFF_Y="11.1"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="1833.512" BBK_DIFF="13.8" BBK_DIFF_Y="-1.7"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="1611.169" BBK_DIFF="14.3" BBK_DIFF_Y="5.5"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="1409.189" BBK_DIFF="7.1" BBK_DIFF_Y="8.5"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="1315.29" BBK_DIFF="-9.5" BBK_DIFF_Y="6.7"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="1453.703" BBK_DIFF="23.2" BBK_DIFF_Y="11.3"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="1179.733" BBK_DIFF="-6.4" BBK_DIFF_Y="6.2"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="1260.714" BBK_DIFF="-13.3" BBK_DIFF_Y="7.4"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="1454.736" BBK_DIFF="24.8"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="1165.735" BBK_DIFF="-15.6"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="1380.939" BBK_DIFF="-13.2"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="1591.274" BBK_DIFF="-11.1"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="1789.584" BBK_DIFF="-4.0"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="1865.052" BBK_DIFF="22.2"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="1526.805" BBK_DIFF="17.6"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="1298.475" BBK_DIFF="5.3"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="1233.029" BBK_DIFF="-5.6"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="1306.394" BBK_DIFF="17.6"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="1110.901" BBK_DIFF="-5.4"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="1173.817"/>
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  </bbk:DataSet>
</CompactData>
