It is the world's fourth-largest food crop, following rice, wheat and maize.[1] The annual diet of an average global citizen in the first decade of the 21st century included about 33 kg (73 lb) of potato.[1] The potato was first domesticated by the Andean civilizations in the region of modern-day southern Peru and extreme northwestern Bolivia[2] between 8000 and 5000 BCE.[3] It has since spread around the world and become a staple crop in many countries.