Australia is a highly developed country, with the world’s fourteenth-largest economy. It has a high-income economy, with the world’s tenth-highest per capita income.It is a regional power and has the world’s thirteenth-highest military expenditure. Immigrants account for 30% of the population, the highest proportion in any country with a population over 10 million. Having the third-highest human development index and the eighth-highest ranked democracy globally, the country ranks highly in quality of life, health, education, economic freedom, civil liberties, and political rights, with all its major cities faring well in global comparative livability surveys. Australia is a member of the United Nations, G20, Commonwealth of Nations, ANZUS, Organisation for Economic Co-operation and Development (OECD), World Trade Organization, Asia-Pacific Economic Cooperation, Pacific Islands Forum, and the ASEAN Plus Six mechanism.