19860118
       19840115      71.0
       19840116      79.6
       19840119      73.8
       19860118     100.0
       19860119      77.1
       19870113      70.5
       19870115      70.1
       19880115      70.9
       19880117      70.3
       19880122      78.7
       19900114      82.6
       19900118      77.5
       19950117      71.2
       19960114      78.8
       19960128      72.8
       19960130      73.1
       19960131      73.8
       19980131      74.9
       20050110      78.1
       20060121      72.5
       20060122      70.1