19810106   71.2
  19840114   80.5
  19840115   87.9
  19840116   84.2
  19840117   79.4
  19840131   86.0
  19860118   73.8
  19870106   80.8
  19870115   78.6
  19880116   75.0
  19880117   81.6
  19880119   72.7
  19880120   75.7
  19880121   72.4
  19880122   75.6
  19880126   76.3
  19880130   71.3
  19890120   83.8
  19900124   81.6
  19920102   71.0
  19920107   71.8
  19930101   82.6
  19930115   87.7
  19930129   79.0
  19950116   70.6
  19960126   71.2
  19960127   92.3
  19960130   71.5
  19960131   72.8
  19980101   80.8
  19980106   76.8
  19980128   73.2
  19990119   70.2
  19990125   72.1
  20000114   81.4
  20010116   72.8
  20010117   74.8
  20010119   83.7
  20060117   86.2
  20060118   70.1
  20060121   89.4
  20060122   71.3
  20090113   73.1