Cash crops (as of 1999) grown under irrigation in these areas include cotton and cottonseed, which is of primary importance to the economy with 172,000 tons and 131,000 tons produced annually respectively, sesame (220,000 tons), sugarcane (5,950,000 tons), peanuts (980,000 tons), dates (176,000 tons), citrus fruits, yams (136,000 tons), tomatoes (240,000 tons), mangoes, coffee, and tobacco. The main subsistence crops produced in Sudan are sorghum (3,045,000 tons), millet (1,499,000 tons), wheat (168,000 tons), cowpeas, beans, pulses, corn (65,000), and barley. Cotton is the principal export crop and an integral part of the country's economy and Sudan is the world's third largest producer of sesame after India and China.