Oman is one of the world´s biggest oil producing countries and oil and natural gas extraction account for 51 percent of GDP. The services sector represents 37 percent of the wealth. Within services the largest segments are: wholesale and retail trade (8 percent of GDP); public administration and defense (7 percent) and transport, storage and communication (6.8 percent). Manufacturing and mining contribute for 6 percent of GDP, construction and electricity and water distribution for 5 percent and agriculture for the remaining 1 percent.