Saudi Arabia
Proven anddeclaredreserves may differ greatly as it is in a nationsstrategic interest to treat both separately and many nations hold their best estimate of actual, proven recoverablereservesas a state secret.
Also note that ever decreasing reserves require significantly higher cost and time to access, so declared reserves may not be translated directly to current production rates over a limited time.
Lastly oil reserves may include different grades and types of oil. For example Canada shale oil reserves may exceed Saudi Arabia's, but the cost and trouble to extract those reserves make it difficult to compare the two.
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