Approximately 30% of the population is nomadic or semi-nomadic; horse culture remains integral. Buddhism is the majority religion, with the nonreligious being the second-largest group. Islam is the second-largest religion, concentrated among ethnic Kazakhs. Most citizens are ethnic Mongols, with roughly 5% of the population being Kazakhs, Tuvans, and other minorities, who are especially concentrated in the west. Mongolia is a member of the United Nations, Asia Cooperation Dialogue, G77, Asian Infrastructure Investment Bank, Non-Aligned Movement and a NATO global partner. Mongolia joined the World Trade Organization in 1997 and seeks to expand its participation in regional economic and trade groups.