If you ignore context for NBA seasons, especially those before the 3-point line, you miss many elite scorers from the first three decades of The Association.
In order to normalize performances from different eras we need a constant baseline for every NBA season. Comparing scoring to the league average each year is one tool we can use to get a clear idea of the offensive value every player has brought to his team.
The chart above displays shooting efficiency as 'Points per 100 Shot Attempts'. This data-point going back each season to 1947 is used throughout NBA Metrics and forms the foundation of stats like True Shooting+ and Points Above Average.