This chart is complete garbage though, it's graphing inflation adjusted income against inflation... If you want a comparison it's possible to draw a valid conclusion from you need to compare non-inflation adjusted income.

If I'm being charitable, they made a mistake in their analysis, if I'm uncharitable they didn't care about the methodology and went in looking for a way to write a provocative conclusion like "86% less purchasing power". Obviously a lot of energy was spent here drawing up the pretty infographics, probably should have spent more energy getting the basic statistics correct first?