To me it looks like: OPEC has peaked!

An assessment of James Hamilton and Menzie Chinn illustrate how the OPEC quotas and the actual oil production differs:

James D. Hamilton is Professor of Economics at the University of California, San Diego

Menzie Chinn is Professor of Public Affairs and Economics at the University of Wisconsin, Madison

Read the following article by Econbrowser.com:

OPEC production quotas
The interpretation that I have been favoring for why Saudi production fell by a million barrels per day over the last two years is that production from northern Ghawar, their most important oil field, has peaked.