19820124
       19800126      77.5
       19810115      70.0
       19820103      80.4
       19820104      80.3
       19820112      70.4
       19820123      76.1
       19820124     100.0
       19820125      72.8
       19850117      73.7
       19860108      74.4
       19920122      76.3
       19970104      79.2
       19990106      70.9
       20000101      76.1
       20000102      82.5
       20000103      79.3
       20020108      71.0
       20030128      75.3
       20030129      78.9
       20030130      79.8
       20050117      70.6
       20060130      73.6
       20090121      80.2