One reason for forest depletion is to grow cash crops. Nine West African countries depend on cash crop exports. Products like gum, copal, rubber, cola nuts, and palm oil provide rather steady income revenue for the West African countries. Land use change spoils entire habitats with the forests. Converting forests into timber is another cause of deforestation. Over decades, the primary forest product was commercial timber. Urbanized countries account for a great percentage of the world's wood consumption, that increased greatly between 1950 and 1980. Simultaneously, preservation measures were reinforced to protect European and American forests. Economic growth and growing environmental protection in industrialized European countries made request for tropical hardwood become strong in West Africa. In the first half of the 1980s, an annual forest loss of 7,200 km2 (2,800 sq mi) was note down along the Gulf of Guinea, a figure equivalent to 4-5 per cent of the total remaining rain forest area. By 1985, 72% of West Africa's rainforests had been transformed into fallow lands and an additional 9% had been opened up by timber exploitation.