land is irrigated, compared with 10 percent in the U.S. The large majority of farms are small, collectively-owned ejidos. While some ejidos employ modem cultivation techniques, traditional practices are the norm. A relatively few large farms and ranches provide significant portions of Mexico's food, particularly for export crops. These enterprises frequently are highly advanced. While Mexico produces surpluses of some fruits and vegetables, nuts, and coffee, it relies upon imports to have sufficient grains, milk (Mexico is the world's largest importer of powdered milk), edible fats and oils. In addition and despite significant increases in domestic processing, imports of processed food products have grown dramatically in recent years. Approximately 80 percent of Mexico's food imports and 90 percent of exports are with the U.S. U.S. exporter have a 90 percent market share of consumer-ready products, including perishables. Virtually all of the major U.S. fast food chains, including some specializing in Mexican foods, are established in Mexico and growing rapidly. The only perishables for which the U.S. is not the primary supplier are cheese and some specialty fish, such as smoked salmon (U.S. Agricultural Trade Office). An impediment for U.S. exporters, regarding the former is that Mexicans have not traditionally eaten yellow cheeses. However, this may be changing with generic and brand advertising and experience with yellow cheeses through fast food outlets. Processed Foods Food processing industry is an important and growing industry in Mexico. It is the largest manufacturing subdivision, accounting for 20 percent of the manufacturing Gross Domestic Product and 5 percent of overall Gross Domestic Product. Food processing grew at an average annual rate of 3.9 percent per year from 1989 through 1992. U.S. firms have played