Austria is a parliamentary representative democracy with a directly elected Federal President as head of state and a Chancellor as head of the federal government. Major urban areas of Austria include Vienna, Graz, Linz, Salzburg and Innsbruck. Austria is consistently ranked in the top 20 richest countries in the world by GDP per capita terms. The country has achieved a high standard of living and in 2018 was ranked 20th in the world for its Human Development Index. Vienna consistently ranks in the top internationally on quality-of-life indicators.