Corruption Perception Index 2012 - Transparency International

The Corruption Perceptions Index ranks countries and territories based on how corrupt their public sector is perceived to be. A country or territory’s score indicates the perceived level of public sector corruption on a scale of 0 - 100, where 0 means that a country is perceived as highly corrupt and 100 means it is perceived as very clean.  - 2012 Corruption Perceptions Index
The 10 Most Corrupt Countries In The World: Report

Transparency International - the global coalition against corruption