Recent as in only a generation or so. It the 60s and 70s it was far behind much of Europe and the US.
As opposed to selling exploitation rights to investors to enrich a kleptocracy.
According to Wikipedia, there are discussions about how much of the oil revenues should be saved; opponents of using more of them directly say that it would just lead to inflation.
https://en.wikipedia.org/wiki/The_Government_Pension_Fund_of...