On October 6, 2010, China News Service (CNS) reported that, in the 8-year period from 2002 to 2009, more than 260,000 Chinese people over the age of 18 obtained U.S. citizenship. The report was based on statistics from the U.S. Department of Homeland Security.
Since 2005, over 30,000 Chinese nationals have become U.S. citizens each year. In 2008, the figure surpassed 40,000; in 2009, it was over 37,000. The average waiting period for a Chinese to get citizenship, from the time the green card is issued, is 7 years.
Source: China News Service (CNS), October 06, 2010
http://www.chinanews.com.cn/hr/2010/10-06/2569916.shtml