Australia has a capitalist economy which is ranked one of the largest in the world. Australia has the third highest life expectancy in the world, ranking below only Iceland and Switzerland. About 25 percent of Australians were born in another country, the largest influx being from the United Kingdom. English is the dominant language in Australia, followed by Italian and Greek. Even though English is the most common language of Australia, the country does not have an official national language. The Protestant religion is most popular, followed by the Roman Catholic religion.