France retains its centuries-long status as a global centre of art, science and philosophy. It hosts the fifth-largest number of UNESCO World Heritage Sites and is the world's leading tourist destination, receiving over 89 million foreign visitors in 2018. France is a developed country with the world's seventh-largest economy by nominal GDP and ninth-largest by PPP; in terms of aggregate household wealth, it ranks fourth in the world. France performs well in international rankings of education, health care, life expectancy and human development. It remains a great power in global affairs, being one of the five permanent members of the United Nations Security Council and an official nuclear-weapon state. France is a founding and leading member of the European Union and the Eurozone, as well as a key member of the Group of Seven, North Atlantic Treaty Organization (NATO), Organisation for Economic Co-operation and Development (OECD) and La Francophonie.