Global income inequality


Though I am not sure about finding date that gives the breakdown just as you describe, there are two sources that come to mind that could be useful resources.

One is the United Nation Development Reports statistical data, which tracks progress on the millenium development goals. Here is the link for getting data by indicator -- you may already know about these reports.

The second is a cool tool created by the organization called Gapminder -- it has an interactive statistical visualization using the UN data called Gapminder World

Related Question