Range graded proportional circle map

Proportional circle maps utilize simple discs of varying proportions to depict different values of a certain subject or area of study. This graph shows most of the countries of the world and shows there populations in these proportional circles and then graphs them with two other varibles like life expectence and income ratings per person. I do not have the hyperlike for this graph from the original website. This is taken from a fellow mappers blogsite. However I have been to the website before and used it extensively in my Globalization class. If you happen to know what website this graph came from please write it on the response page of this Blog site. Thank you.
http://ktmaps.blogspot.com/2010/07/proportional-circle-map.html