Continuously variable proportional circle maps are a slightly more complex version of a proportional circle map. This version uses a scale to give the reader more insight to reference an actual number associated with the size of the circle, without losing the quick reference of size that a proportional circl map provides.
Found - www.padesatprocent.cz
This blog is a map catalog in which I am displaying fifty different types of maps and a tid-bit of information that looks into the purpose of the map!