It's a gradient. It gets worse as you get higher up. The top 0.1% or 1% is gaining a larger portion of the income than they did 10 or 20 years ago. So the cut-off point is probably around the top 30%. They have seen incomes increase over the past 30 years. Once you get below that point, you see real income stagnate.
On November 2nd, 2011. See this statement in context.