The OCR was introduced in March 1999 and was reviewed eight times a year up to 2015 by the Reserve Bank of New Zealand . Since 2016 , the OCR is reviewed seven times a year . Monetary Policy Statements are issued with the OCR on four of those occasions . Unscheduled adjustments to the OCR may occur at other times in response to unexpected or sudden developments , but to date this has occurred only once , following the 11 September 2001 attacks on the United States
11 September 2001 attacks
September 11 attacks
Official cash rate