The city's significant minority of Chinese, mostly Cantonese ancestors, were brought in the mid-19th century by Spanish settlers via the Philippines with work contracts and after completing 8-year contracts many Chinese immigrants settled permanently in Havana. Before the revolution the Chinese population counted to over 200,000, today, Chinese ancestors could count up to 100,000. Chinese born/ native Chinese (mostly Cantonese as well) are around 400 presently. There are some 3,000 Russians living in the city; as reported by the Russian Embassy in Havana, most are women married to Cubans who had studied in the Soviet Union. Havana also shelters other non-Cuban population of an unknown size. There is a population of several thousand North African teen and pre-teen refugees.