Since 1995, Transparency International has published an annual Corruption Perceptions Index (CPI) ordering the countries of the world according to "the degree to which corruption is perceived to exist among public officials and politicians". The organization defines corruption as "the abuse of entrusted power for private gain".
Transparency International's 2009 Corruption Perceptions Index is the world's most credible measure of of domestic, public sector corruption. The CPI is an aggregate indicator that combines different sources of information about corruption, making it possible to compare countries.
Method CPI calculation
The CPI 2010 is calculated using data from 13 different surveys or assessments produced by the following 10 independent organisations:


