As of 2014, over 97 percent of Angola's exports are in the form of crude petroleum and other petroleum byproducts. Angola is a member of the Organization of the Petroleum Exporting Countries, or OPEC, an organization of Middle Eastern and African nations that export large amounts of crude oil.
Diamonds are the second-largest export for Angola, and they totaled up to 7 percent of all exports in the early 2000s. However, crude oil has taken up increasing amounts of the country's export totals. As of 2007, when Angola joined OPEC, it was the eighth-largest supplier of oil to the United States and often one of the largest suppliers to China. Angola is the largest exporter of crude oil in the sub-Saharan region of Africa.