sentences:  The US Department of State estimated in 2004 that there were 45,000 American citizens living in Hong Kong.In recent years, there has also been an increase in Chinese Americans coming to Hong Kong as exchange students or to work for a short time, or even to settle permanently.For example, as recently as the 1960s, virtually all exchange students at the Chinese University of Hong Kong were European Americans, but in recent years, Chinese Americans have become one of the largest, if not the largest, demographic exchange student group.