Here are the five biggest publicly traded companies (and their home countries) by oil production:

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2011

No. 1: PetroChina Co. Ltd. (China)

No. 2: Rosneft (Russia)

No. 3: Exxon Mobil Corp. (USA)

No. 4: Petroleo Brasileiro SA (Brazil)

No. 5: BP PLC (United Kingdom)

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2010

No. 1: Exxon Mobil Corp. (USA)

No. 2: BP PLC (United Kingdom)

No. 3: PetroChina Co. Ltd. (China)

No. 4: Rosneft (Russia)

No. 5: Petroleo Brasileiro SA (Brazil)