A businessman walks past an electric quotation board flashing the Nikkei key index of the Tokyo Stock Exchange (TSE) in front of a securities company in Tokyo on February 9, 2016. Tokyo shares tumbled nearly five percent, extending a global sell-off as a stronger yen dented exporters and after oil prices tanked again on fears of a deepening economic slowdown. AFP PHOTO/Toru YAMANAKA / AFP / TORU YAMANAKA