http://images.google.com/imgres?imgurl=http://www.neiu.edu/~jrthomas/377/circle.jpg&imgrefurl=http://www.neiu.edu/~ejhowens/377/examples.htm&usg=__74j5gvuGOBKd2EeZDxUWa-X0O54=&h=584&w=678&sz=118&hl=en&start=11&um=1&tbnid=-Wjkl8dbn8ZEYM:&tbnh=120&tbnw=139&prev=/images%3Fq%3Dproportional%2Bcircle%2Bmap%26um%3D1%26hl%3Den%26sa%3DN
Proportional circle maps are used to represent the percentage of a certain thing in different areas. In this case it shows the percentage of houses built before 1940 in different states.
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