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[–][deleted] 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

They do. For example, at the first link, top graph, contrast bar graphs for 1979 and 1990, regarding the top 10% (light blue lines) and bottom 10% (brown lines). (You should know how to do this, given your profession.)