Burundi is a landlocked, resource-poor country with an underdeveloped manufacturing sector. The economy is predominantly agricultural, accounting for 50% of GDP in 2017 and employing more than 90% of the population. Subsistence agriculture accounts for 90% of agriculture. Burundi's primary exports are coffee and tea, which account for 90% of foreign exchange earnings, though exports are a relatively small share of GDP. Other agricultural products include cotton, tea, maize, sorghum, sweet potatoes, bananas, manioc (tapioca); beef, milk and hides. Even though subsistence farming is highly relied upon, many people do not have the resources to sustain themselves. This is due to large population growth and no coherent policies governing land ownership. In 2014, the average farm size was about one acre.