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Source: CNN Money. Exxon is the second largest company in the US as far as revenues go. However, its revenues have dropped by more than 7 percent from the previous year along with decreased oil production and increasing exploration expenditures.
At those levels, Sudan is not one of the world's largest oil producers: It currently ranks 30th, between Australia and Ecuador. (Saudi Arabia, for comparison, produces nearly 9 million barrels per day.).