UPDATE 1-Rio Tinto posts best annual profit in nearly a decade, declares bumper dividend

(Adds details on results, background, comment) Feb 17 (Reuters) - Rio Tinto (LON:RIO) RIO.AX on Wednesday reported its best annual earnings since 2011 and declared a record final dividend as iron ore prices surged on strong demand from top consumer China's aggressive investments in infrastructure. China's infrastructure focus pushed its...