Australia is a highly developed country, with the world's twelfth-largest economy. It has a high-income economy, with the world's tenth-highest per capita income. Australia is a regional power, and has the world's thirteenth-highest military expenditure. Immigrants account for 30% of the country's population, the highest proportion among major Western nations. Having the eighth-highest Human Development Index, and the ninth-highest ranked democracy globally as of 2020, Australia ranks highly in quality of life, health, education, economic freedom, civil liberties, and political rights, with all its major cities faring exceptionally in global comparative livability surveys. It is a member of international groupings including the United Nations, the G20, the Commonwealth of Nations, ANZUS, AUKUS, Five Eyes, the Quad, the OECD, the WTO, APEC, the Pacific Islands Forum and the Pacific Community.