Sierra Leone is an extremely impoverished country with an economy primarily based on agriculture and mining. Sierra Leone has vast deposits of diamonds, gold, rutile, and bauxite. Diamonds make up the country's principal export. About two-thirds of the working-age population engages in subsistence agriculture. Manufacturing consists mainly of the processing of raw materials and of light manufacturing for the domestic market. The most significant products are palm kernels, palm oil, cocoa and coffee, and food crops including rice (the main food crop), cassava, corn, millet, and peanuts. The principal imports are foodstuffs, machinery, transportation equipment, fuels, and chemicals; the chief exports are diamonds and other minerals, cocoa, coffee, and fish. Sierra Leone's leading trade partners are Belgium, Germany, the United States, and Cte d'Ivoire.