The race to become Africa's next "super banker" ends on Thursday, with five candidates, including one woman, vying to succeed Nigeria's Akinwumi Adesina as head of the African Development Bank in a contest that appears too close to call. In 2015 it took six rounds of voting to elect Adesina as president of the AfDB, which was founded in 1964 and now has 81 members, including 54 African nations.
