19860106
       19800112      79.8
       19800113      71.5
       19820112      76.6
       19850109      76.1
       19850117      71.0
       19850118      72.7
       19850119      76.6
       19850120      74.8
       19860106     100.0
       19880110      76.7
       19920117      72.9
       19920122      71.9
       19940104      82.0
       19970103      82.3
       19980109      73.3
       19990103      70.2
       20000127      72.1
       20020119      73.0
       20040102      74.8
       20040115      76.2