Russia is one of the world's leading producers of oil and natural gas and is also a top exporter of metals such as steel and primary aluminum. On the production side, services are the biggest sector of the economy and account for 58 percent of GDP. Within services the most important segments are: wholesale and retail trade (17 percent of total GDP); and public administration, health and education (12 percent). Industry constitutes 40 percent to total output and agriculture accounts for the remaining 2 percent.