The key Nikkei stock index rose Monday to end at a fresh five-year, five-month high on buying prompted by the yen’s fall against the dollar and recent strength on Wall Street.

Extending its winning streak to five trading days, the 225-issue Nikkei average rose 90.55 points, or 0.55 percent, to 16,551.23, its highest closing since Sept. 4, 2000.

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