Since RMB decoupled from the US dollar in June 2005, until June 2010, the accumulated increase during these five years was 1.4856, or 17.95%, averaging an annual appreciation of 3.59%. If the Renminbi-US Dollar exchange rate keeps this appreciating speed in the next five years, it will rise to 1:5.57 by 2015, and reach 1:4.57 by 2020.