The Nikkei 225 Index decreased 163 points or 0.25 percent on Thursday to close at 66099 points. The decline was led by Advantest (-3.33%), Yamaha Motor (-2.94%) and Takara (-2.72%). On the upside, the strongest performers were Furukawa Electric (4.51%), Mitsubishi Chem (3.58%) and Fujikura (3.37%).