“China’s central bank is under increasing pressure from policy advisers to let the yuan currency fall quickly and sharply, by as much as 10-15 percent, as its recent gradual softening is thought to be doing more harm than good. The PBOC has spent billions of dollars buying yuan over recent months to defend the exchange rate, but has failed to stabilize market sentiment. The currency has steadily lost another 2.6 percent against the U.S. dollar even after the bank sprung a surprise devaluation of nearly 2 percent in August. China’s foreign exchange reserves fell by more than half a trillion dollars last year as the central bank bought yuan to support the exchange rate.”
http://www.reuters.com/article/us-china-markets-yuan-policymakers-idUSKBN0UL24020160107