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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.
PetroChina is the fifth largest oil and gas company in the world. It produced 916.5 million barrels of crude oil and 2.558 trillion cubic feet of natural gas in 2012. Overseas crude oil production by the company during the year stood at 136.9 million barrels.