The majority of Bangkok's population identify as Thai, although details on the city's ethnic make-up are unavailable, as the national census does not document race. Bangkok's cultural pluralism dates back to the early days of its founding: several ethnic communities were formed by immigrants and forced settlers including the Khmer, northern Thai, Lao, Vietnamese, Mon and Malay. Most prominent were the Chinese, who played major roles in the city's trade and became the majority of Bangkok's population—estimates include up to three-fourths in 1828 and almost half in the 1950s. Chinese immigration was restricted from the 1930s and effectively ceased after the Chinese Revolution in 1949. Their prominence subsequently declined as younger generations of Thai Chinese integrated and adopted a Thai identity. Bangkok is still nevertheless home to a large Chinese community, with the greatest concentration in Yaowarat, Bangkok's Chinatown.