The central parity of the Renminbi (RMB), or China's currency yuan, weakened to 6.7909 per U.S. dollar on Wednesday from Tuesday's 6.7901, according to the data released by the China Foreign Exchange Trading System.

On Tuesday, the central parity of RMB against the U.S. dollar weakened to 6.7901 from Monday's 6.7890, the strongest since China announced to unpeg the yuan from the U.S. dollar in July 2005.