An estimated 2,600 ethnic Vietnamese live in Bulgaria according to a 2015 estimate. Under international agreements in 1980, Bulgaria, along with other Warsaw Pact members, accepted Vietnamese guest workers who were sponsored by the communist government into the country as a relatively cheaper manual labour workforce. At one point, over 35,000 Vietnamese people worked in Bulgaria between 1980 and 1991, and many Vietnamese students completed their higher education at various Bulgarian universities. As of 2011, there were over 110,000 ethnic Vietnamese people in South Korea, making them the second largest minority group in the country. Vietnamese in South Korea consist mainly of migrant workers and women introduced to South Korean husbands through marriage agencies. In the 13th century, several thousand Vietnamese fled to Korea following the overthrow of the Vietnamese Lý Dynasty, where they were received by King Gojong of Goryeo. The Fall of Saigon in 1975 at the end of the Vietnam War saw many Vietnamese refugees escaping by boats to Malaysia. The first refugee boat arrived in Malaysia were in May 1975, carrying 47 people. A refugee camp was established later at Pulau Bidong in August 1978 with the assistance of the United Nations, and became a major refugee processing center for Vietnamese seeking residency in other countries. While a very small number of Vietnamese refugees settled in Malaysia, the majority of Vietnamese in Malaysia consist of skilled and semi-skilled workers who arrived during the 1990s as economic cooperation between Vietnam and Malaysia increased. Vietnamese form one of the largest foreign ethnic groups in Taiwan, with a resident population of around 200,000. Including students and migrant workers, the Vietnamese population in Taiwan is about 200,000. Vietnamese in Taiwan largely arrived as workers in the manufacturing industry or domestic helpers. There are also a large number of Vietnamese women married to Taiwanese men through international matchmaking services in Vietnam, despite the illegality of such services in the country. Over 135,000 Vietnamese people resided in Japan at the end of 2014. In 2019, around 371,755 Vietnamese people lived in Japan, making it the third largest foreign community in the country. At least 190,000 are "skilled trainees" and this particular number is growing sharply. Vietnamese people first came to Japan as students beginning in the 20th century. However, the majority of the community is composed of refugees admitted in the late 1970s and early 1980s, as well as a smaller proportion of migrant laborers who began arriving in 1994. As Vietnam and Laos are neighbors, there has been a long history of population migrations between the territories which make up the two respective countries.