I'm not sure what the "mythical 82 mmbd" idea is. How is it mythical?
Anyway, you shouldn't ascribe too much accruracy to these figures. Bottom line: no one really knows with precision what world production is since OPEC doesn't release accurate figures. You also have to know what is included in a "production" figure since different organization report differently.
Take BP and IEA for example. The BP chart you showed has 2004 production at 80.3 mmbd. The definition of production includes "crude oil, shale oil, oil sands and NGLs (natural gas liquids – the liquid content of natural gas where this is recovered separately)".
Then look at IEA's figures for 2004 (as of the
June 2005 Oil Supply Monthly, p. 42.) They have 2004 production at 83.1 mmbd, with the definition of "crude oil, condensates, NGLs, oil from non-conventional sources and other sources of supply". The IEA numbers also include processing gain of 1.8 mmbd. Subtract the processing gain and supply would be 81.3 mmbd, or 1 mmbd higher than BP. Is the difference condensates and "other sources of supply"? Hard to say. They even have a convenient table to show you how much their historical figures are revised after the fact.
IEA shows 1Q05 supply at 83.8 mmb/d by their supply definition.