Agriculture in Portugal is based on small to medium-sized family-owned dispersed units. However, the sector also includes larger scale intensive farming export-oriented agrobusinesses backed by companies (like Grupo RAR's Vitacress, Sovena, Lactogal, Vale da Rosa, Companhia das Lezírias and Valouro). The country produces a wide variety of crops and livestock products, including: tomatoes, citrus, green vegetables, rice, wheat, barley, maize, olives, oilseeds, nuts, cherries, bilberry, table grapes, edible mushrooms, dairy products, poultry and beef. According to FAO, Portugal is the top producer of cork and carob in the world, accounting to about 50% and 30% of world production respectively. It is also the third largest exporter of chestnut and the third largest European producer of pulp. Portugal is among the top ten largest olive oil producers in the world and is the fourth biggest exporter. The country is also one of the world's largest exporters of wine, being reputed for its fine wines.