For that indicator, The U.S. Energy Information Administration provides data for Russia from 1997 to 2019. The average value for Russia during that period was 63.14 billion barrels with a minumum of 48.57 billion barrels in 1999 and a maximum of 80 billion barrels in 2013.
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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.