Currently, Afro-Asian births are on the rise resulting from the arrival of African students in cities such as Nanjing, Hangzhou and Shanghai. Another contributing factor is the strengthened trade relationships between Africa and China which have invited an influx of African immigrants into China, primarily Nigerians who have formed a small, yet progressive, community in the country. In October 2010, Chinese officials estimated about 500 mixed marriages between Africans and Chinese. In places such as Guangzhou, a progressive population of about 10,000 African entrepreneurs continues to thrive.