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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.
Today, PetroChina is one of the world's largest companies by market capitalization. It is also China's largest producer of oil and natural gas. Last year, the company's output from production included 932.9 million barrels of oil, as well as 2.8 trillion cubic feet of natural gas.