China' foreign exchange reserves in June unexpectedly rose $20 billion to $3.21 trillion, central bank data showed on Thursday, rebounding from a 5-year low in May. Foreign exchanges reserves stood at $3.21 trillion at the end of June, the People's Bank of China reported on its website. Economists polled by Reuters had predicted reserves would fall by $20 billion to $3.17 trillion. China's reserves, the largest in the world, fell by $27.9 billion to $3.19 trillion in May, their lowest since December 2011. China's yuan currency has fallen to 5-1\/2 year lows, reviving worries about its cooling economy and a possible resurgence in capital outflows.