Many different sorts of maps fall under the umbrella of statistical maps. Dot distribution maps, choropleth maps and proportional circle maps are some main examples. In the map above percent change in population for each individual state is shown. The exact percent is shown for each state along with different shades of green which represent different ranges.
http://reviews.libraryjournal.com/2012/03/reference/statistical-abstract-saved-by-proquest-and-bernan-press/
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