19850109
       19800113      80.8
       19800114      74.8
       19830121      84.2
       19830122      76.0
       19850109     100.0
       19850110      72.0
       19850118      77.3
       19850119      82.4
       19850128      81.7
       19860106      76.1
       19860107      72.6
       19870118      70.7
       19880101      70.7
       19880110      70.5
       19910105      73.3
       19920118      75.6
       19940104      79.6
       19970103      73.2
       19980109      74.3
       20020118      70.6
       20040113      78.8
       20040114      76.1
       20040115      84.6
       20040116      84.1
       20080131      71.1
       20090105      78.2