Yemen is a member of the Arab League, the United Nations, the Non-Aligned Movement and the Organisation of Islamic Cooperation. It belongs to the least developed country group, referring to its numerous "severe structural impediments to sustainable development". In 2019, the United Nations reported that Yemen is the country with the most people in need of humanitarian aid, about 24 million people, or 85% of its population. As of 2020, the country is placed the highest in the Fragile State Index, the second worst in Global Hunger Index, surpassed only by the Central African Republic, and has the lowest Human Development Index out of all non-African countries.