Agriculture constitutes around 85% of the labour force. However, the service sector represents the largest portion of the GDP. Many other economic activities depend on agriculture, including marketing, processing, and export of agricultural products. Production is overwhelmingly by small-scale farmers and enterprises, and a large part of commodity exports are provided by the small agricultural cash-crop sector. Principal crops include coffee, legumes, oilseeds, cereals, potatoes, sugarcane, and vegetables. Ethiopia is also a Vavilov centre of diversity for domesticated crops, including enset, coffee and teff.