Continuously variable proportional circle maps use circle within a map to represent proportion of data being measured. The continuously variable proportional circle map below shows the major industry in certain areas of West Germany.
http://3.bp.blogspot.com/_2rFpt0ZHGzg/TPlblaTQtNI/AAAAAAAAAHI/HigiFXZslCM/s1600/west_germany_ind_1972.jpg
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