The automotive industry is made up of companies that design, develop, manufacture, market and sell motor vehicles. It is one of the world's largest economic sectors by revenue. China has been the world's largest producer of motor vehicles since 2009, producing over 25% of vehicles globally in 2013. Other major producers include the United States, Japan, Germany, India and South Korea. The top automotive companies are Toyota, General Motors, Volkswagen, Hyundai, Ford, and Nissan. Safety, fuel efficiency and limiting environmental impact are major concerns in the industry.