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The city-state is classified as an Alpha+ global city, indicating its influence on the global economy. Singapore is the only country in Asia with an AAA sovereign rating from all major rating agencies, and one of 11 worldwide. Singapore is a highly developed country and is ranked 9th on the UN Human Development Index, the highest in Asia for a sovereign state, with the 3rd highest GDP per capita in the world. It was ranked the most expensive city to live in from 2013 to 2019 by the Economist. It is identified as a tax haven. Singapore is placed highly in key social indicators: education, healthcare, quality of life, personal safety and housing, with a home-ownership rate of 90%. Singaporeans enjoy one of the world's longest life expectancy and one of the lowest infant mortality rates in the world. As of 2019, Singaporean citizens had visa-free or visa-on-arrival access to 189 countries and territories, ranking the Singaporean passport 1st in the world, tied with Japan.