The politically and culturally dominant Lao people make up 53.2% of the population, mostly in the lowlands. Mon-Khmer groups, the Hmong, and other indigenous hill tribes live in the foothills and mountains. Laos' strategies for development are based on generating electricity from rivers and selling the power to its neighbours, namely Thailand, China, and Vietnam, as well as its initiative to become a "land-linked" nation, as evidenced by the construction of four new railways connecting Laos and neighbours. Laos has been referred to as one of Southeast Asia and Pacific's fastest growing economies by the World Bank with annual GDP growth averaging 7.7% since 2009.