Cambodia's economy has been based traditionally on agriculture. About 85% of the cultivated area is devoted to the production of rice, while rubber trees account for a major part of the remainder. Prior to the war years, Cambodia's rice crop was usually ample enough to permit exports. The Tonle Sap is one of the major fishing reservoirs in Asia, and its products have played a key role in the Cambodian economy and diet. Cattle breeding is another important source of income