The oil and gas sector accounts for about 10 per cent of gross domestic product, and petroleum exports revenue represents around 86 per cent of total exports revenue. Its currency is the naira. Nigeria’s Head of State and Commander-in-Chief of the Armed Forces is HE Muhammadu Buhari. The country joined OPEC in 1971. Saudi Arabia and Russia also top the list of oil exporting countries, while Russia is not a member of OPEC. The monthly U.S. oil production reached 10.07 million b/d in November 2017, the highest monthly level of crude oil production in U.S. history. In May of 2019, the country became a net oil and gas exporter, the first time since 1953. World Oil provides news, oil prices, data, statistics, shale reports and upstream industry trends relating to the exploration, drilling, completion and production of oil and gas, both onshore and