Ending the longest period of unchanged rates since 1950, the central bank cut the overnight rate to 0.75 percent from 1 percent, where it had been since September 2010, and it dramatically slashed its inflation and growth outlook for the coming year.

Oliver declined to offer a judgment on the wisdom of the decision, citing central bank independence, but told a panel at the World Economic Forum in Davos that the oil price had "clearly influenced" the move.

(Reporting by Noah Barkin)