The Sri Lankan economy has traditionally been based on agriculture, which now contributes less than 20% to the gross domestic product and employs about a third of the work force. Sri Lanka's most dynamic industries now are food processing, textiles and apparel, food and beverages, telecommunications, and insurance and banking. Remittances from Sri Lankan working abroad, mainly in the Middle East, contribute significantly to the economy. The island's swift rivers have considerable hydroelectric potential. Exports include textiles and apparel, tea and spices, diamonds, emeralds, rubies, coconut products, rubber goods, and fish. Textile fabrics, mineral products, petroleum, foodstuffs, machinery, and transportation equipment are imported. The United States, India, and Great Britain are the largest trading partners.