The inhabitants of Vanuatu are called  in English, using a recent coinage. The ni-Vanuatu are primarily (98.5%) of Melanesian descent, with the remainder made up of a mix of Europeans, Asians and other Pacific islanders. Three islands were historically colonised by Polynesians. About 20,000  live and work in New Zealand and Australia. In 2006 the New Economics Foundation and Friends of the Earth environmentalist group published the Happy Planet Index, which analysed data on levels of reported happiness, life expectancy and Ecological Footprint, and they estimated Vanuatu to be the most ecologically efficient country in the world in achieving high well-being.