The OPEC quota augmentation has been lost over time to Reserve Growth, New Discoveries & Non-conventional Oils.  For perspective, in 1980 BP's Proven Reserves were 0.667-Tril Barrels compared to 1.189-Tb today.

The USGS/EIA was 1.7-Tb in 1984 and is 3.797-Tb today.

Colin Campbell was 1.578-Tb in 1989 and is 2.t-Tb today.

M.K. Hubbert was 2-Tb in 1973.

etc etc

The Avg in our current Depletion series of 11 forcasters is 2.925-Tb of which 1.909-Tb is future production. http://TrendLines.ca

sorry that should read 2.4-Tb for Campbell.