This article touches the surface of the current production status.
The bigger question is why NO new petroleum refinerys are being constructed, and why the current refinerys are not maintained in the best condition.
The industry, looking towards the future, is seeing the demand for fossil fuels diminish. Global warming is real, and the main contributors are fossil fuels and coal. It's going to be a tough nut to crack but the use of these fuels is either going to be banned, or taxed beyond practicality in the next 10-20 years. It's a must do.
20 years from now electric power, (or some power source we don't even know about), will be the main stay of the transportation industry. Our fuel burners will be museum pieces or subject to heavy use restrictions.
All I can say....... Drive em if ya got em.