The amount of money governments in resource-rich countries’ were able to extract from oil companies rose from $9.90 per barrel in 2000 to $30.40 in 2014.

Government Take in Upstream Oil and Gas: Framing a More Balanced Dialogue, which analyzed the fluctuation of governments’ levies on oil companies, was referenced by the Economist in an article on the volatile state of oil production tax.

The Economist