Income in the United States
Graph of United States income distribution from 1947 through 2007 inclusive, normalized to 2007 dollars. The data is from the US Census, which is a survey over the entire population, not just a sample.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"United States Income Distribution 1947-2007."
http://commons.wikimedia.org/wiki/File:United_States_Income_Distribution_1947-2007.svg
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