Cameroon is located in Central and West Africa, exhibiting all major climates and vegetation of the continent: coast, desert, mountains, rainforest, and savanna. Cameroon's natural resources are very well suited to agriculture and arboriculture, with an estimated 70% of the population farming, and agriculture being an estimated 19.8% of GDP in 2009. Most agriculture is done at the subsistence scale by local farmers using simple tools. They sell their surplus produce, and some maintain separate fields for commercial use. Soils and climate on the coast encourage extensive commercial cultivation of bananas, cocoa, oil palms, rubber, and tea. Inland on the South Cameroon Plateau, cash crops include coffee, sugar, and tobacco. Coffee is a major cash crop in the western highlands, and in the north, natural conditions favour crops such as cotton, groundnuts, and rice. Reliance on agricultural exports makes Cameroon vulnerable to shifts in their prices. The southern rainforest has vast timber reserves. Logging, largely handled by foreign-owned firms, provides the government US$60 million a year in taxes (as of 1998), and laws mandate the safe and sustainable exploitation of timber. Nevertheless, in practice, the industry is one of the least regulated in Cameroon.