By the 20th century, the local export economy had collapsed due to the success of British tea plantations in India. During the Qing and the early 20th century, many southern Fujianese emigrated to Taiwan and Southeast Asia, such as in the Philippines, Indonesia, Brunei, Malaysia, Singapore, Thailand, Myanmar, etc., spreading Hokkien language and culture overseas. Some 350,000 overseas Chinese currently trace their ancestry to Xiamen. Some of this diaspora later returned: an estimated 220,000 Xiamen residents are returning overseas Chinese and their kin. Others continue to help fund universities and cultural institutions in Xiamen.