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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.
1. Nigeria produced more than 2.4 million barrels of oil per day in 2014 to rank as the 13th-largest oil producer in the world. The country has produced between 2.1 million and about 2.6 million barrels per day for the last 18 years.