The World Bank estimates that Thai workers are two times and five times less productive than Malaysian and Singaporean workers respectively. The report assesses the average output of Thai workers at US$25,000 (879,200 baht) in 2014 compared to Malaysia's US$50,000 and US$122,000 for Singapore. A 2016 report by the International Labor Office (ILO) estimates that over 70 percent of Thai workers are in danger of being displaced by automation. Factories in Thailand are estimated to be adding from 2,500–4,500 industrial robots per year. In fiscal year 2015, 71,000 Thais worked abroad in foreign countries. Taiwan employed the most Thai employees overall with 59,220 persons, followed by South Korea at 24,228, Israel at 23,479, Singapore at 20,000, and the UAE at 14,000. Most employees work in metal production, agriculture, textile manufacturing, and electronic part manufacturing fields. As of 2020, Thai migrant labourers overseas generate remittances worth 140 billion baht. The number of migrant workers in Thailand is unknown. The official number—1,339,834 registered migrant workers from Cambodia, Laos, and Myanmar—reported by the Office of Foreign Workers Administration under the Ministry of Labour, represents only legal migrant workers. Many more are presumed to be non-registered or illegal migrants. The Thailand Development Research Institute (TDRI) estimates that there may yet be more illegal migrant workers than legal ones in Thailand. Foreign trade China has replaced the United States as Thailand's largest export market while the latter still holds its position as its second-largest supplier (after Japan). While Thailand's traditional major markets have been North America, Japan, and Europe, economic recovery in Thailand's regional trading partners has helped Thai export growth. Recovery from financial crisis depended heavily on increased exports to the rest of Asia and the United States. Since 2005 the increase in export of automobiles from Japanese manufacturers (particularly Toyota, Nissan and Isuzu) has helped improve the trade balance, with over one million cars produced annually since then. Thailand has joined the ranks of the world's top ten automobile-exporting nations. Machinery and parts, vehicles, integrated circuits, chemicals, crude oil, fuels, iron and steel are among Thailand's principal imports. The increase in imports reflects a need to fuel production of high-tech items and vehicles. Thailand is a member of the World Trade Organization (WTO), the Cairns Group of agricultural exporters and the ASEAN Free Trade Area (AFTA), and has pursued free-trade agreements. A China-Thailand Free Trade Agreement (FTA) began in October 2003. This agreement