19800112   73.0
  19800126   78.4
  19810115   79.7
  19820103   87.6
  19820104   85.1
  19820112   77.3
  19820123   84.8
  19820124   93.2
  19820125   77.9
  19850117   82.5
  19860108   76.2
  19910126   76.7
  19910127   72.4
  19920122   85.4
  19920123   75.2
  19940110   76.5
  19940114   71.8
  19970104   79.5
  19990102   71.4
  19990106   78.0
  20000101   86.6
  20000102   88.3
  20000103   85.9
  20020108   78.9
  20030128   86.4
  20030129   81.7
  20030130   84.7
  20040109   72.3
  20050117   77.5
  20050121   71.1
  20060106   75.8
  20060130   82.5
  20090121   81.1