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      <bbk:Obs TIME_PERIOD="1973-01" OBS_VALUE="132.185" BBK_DIFF="-11.1" BBK_DIFF_Y="33.6"/>
      <bbk:Obs TIME_PERIOD="1972-12" OBS_VALUE="148.68" BBK_DIFF="21.6" BBK_DIFF_Y="24.7"/>
      <bbk:Obs TIME_PERIOD="1972-11" OBS_VALUE="122.26" BBK_DIFF="-11.5" BBK_DIFF_Y="27.9"/>
      <bbk:Obs TIME_PERIOD="1972-10" OBS_VALUE="138.176" BBK_DIFF="30.7" BBK_DIFF_Y="30.1"/>
      <bbk:Obs TIME_PERIOD="1972-09" OBS_VALUE="105.697" BBK_DIFF="-2.3" BBK_DIFF_Y="32.2"/>
      <bbk:Obs TIME_PERIOD="1972-08" OBS_VALUE="108.201" BBK_DIFF="-13.7" BBK_DIFF_Y="25.9"/>
      <bbk:Obs TIME_PERIOD="1972-07" OBS_VALUE="125.325" BBK_DIFF="6.9" BBK_DIFF_Y="20.9"/>
      <bbk:Obs TIME_PERIOD="1972-06" OBS_VALUE="117.195" BBK_DIFF="-3.9" BBK_DIFF_Y="42.3"/>
      <bbk:Obs TIME_PERIOD="1972-05" OBS_VALUE="121.941" BBK_DIFF="8.8" BBK_DIFF_Y="47.5"/>
      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="112.058" BBK_DIFF="-10.4" BBK_DIFF_Y="28.9"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="125.0" BBK_DIFF="29.9" BBK_DIFF_Y="28.3"/>
      <bbk:Obs TIME_PERIOD="1972-02" OBS_VALUE="96.199" BBK_DIFF="-2.8" BBK_DIFF_Y="20.5"/>
      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="98.952" BBK_DIFF="-17.0" BBK_DIFF_Y="37.4"/>
      <bbk:Obs TIME_PERIOD="1971-12" OBS_VALUE="119.199" BBK_DIFF="24.7"/>
      <bbk:Obs TIME_PERIOD="1971-11" OBS_VALUE="95.612" BBK_DIFF="-10.0"/>
      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="106.221" BBK_DIFF="32.8"/>
      <bbk:Obs TIME_PERIOD="1971-09" OBS_VALUE="79.957" BBK_DIFF="-7.0"/>
      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="85.939" BBK_DIFF="-17.1"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="103.65" BBK_DIFF="25.9"/>
      <bbk:Obs TIME_PERIOD="1971-06" OBS_VALUE="82.355" BBK_DIFF="-0.4"/>
      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="82.657" BBK_DIFF="-4.9"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="86.943" BBK_DIFF="-10.7"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="97.415" BBK_DIFF="22.0"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="79.856" BBK_DIFF="10.9"/>
      <bbk:Obs TIME_PERIOD="1971-01" OBS_VALUE="72.031"/>
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  </bbk:DataSet>
</CompactData>
