Oil is as critical to any war effort today as it was throughout both World Wars. Oil drives many facets of the modern military including vehicles and industry. For the purposes of the GFP ranking, oil consumption is applied as a bonus to each nation; the higher its production the better. Oil production is offset by oil consumption and and factored in conjunction with proven oil reserves.
Oil Production data through 2015. The values below are displayed in Barrels per Day (bbl).
Sources: CIA.gov, CIA World Factbook, wikipedia.com, public domain print and media sources and user contributions. Some values may be estimated when official sources are lacking.