Ghana's Jubilee Oilfield which contains up to  of sweet crude oil was discovered in 2007, among the many other offshore and inland oilfields in Ghana. Ghana is believed to have up to  to  of petroleum in reserves, which is the fifth largest in Africa and the 21st to 25th largest proven reserves in the world. It also has up to  of natural gas in reserves, which is the sixth largest in Africa and the 49th largest natural gas proven reserves in the world. Oil and gas exploration off Ghana's eastern coast on the Gulf of Guinea is ongoing, and the amount of both crude oil and natural gas continues to increase. The Government of Ghana has drawn up plans to nationalise Ghana's entire petroleum and natural gas reserves to increase government revenue.