To give the readers a sense of proportionality, Russia has about the same GDP as Italy (About 2 trillion USD). Saudi Arabia is about 10% less at 1.8 trillion USD (PPP 2017 numbers), but an estimated oil reserve of 35 trillion USD, which is approximately thrice as much as what is available in Russia.
One question: Why are you quoting the estimed oil reserve in USD? Wouldn't that number fluctuate a lot due to changes in oil price during the years of extraction? Wouldn't it make more sense to quote it in barrels?
