For that indicator, The U.S. Energy Information Administration provides data for Brazil from 1980 to 2019. The average value for Brazil during that period was 7.39 billion barrels with a minumum of 1.2 billion barrels in 1980 and a maximum of 16.18 billion barrels in 2016.
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Definition: Proved reserves of crude oil are the estimated quantities of all liquids defined as crude oil, which geological and engineering data demonstrate with reasonable certainty to be recoverable in future years from reservoirs under existing economic and operating conditions.