The Corruption Perceptions Index (CPI) is an index that ranks countries “by their perceived levels of public sector corruption, as determined by expert assessments and opinion surveys”. The index is published annually by the non-governmental organization Transparency International since 1995. Corruption Perceptions Index 2020 – published in January 2021, currently ranks 180 countries “on a scale from 100 (very clean) to 0 (highly corrupt)” based on the situation between May 2019 and May 2020.

The Corruption Perceptions Index has collected data from a number of different sources that provide perceptions of businesses and experts in countries about the level of corruption in the public sector.