The Global Corruption Barometer is the only world wide public opinion survey about the views and experiences of corruption.
The Global Corruption Barometer asks for people's views on corruption in their country generally, how the level of corruption has changed and in which institutions the problem of corruption is most severe. It also provides a measure of people's experience of bribery in the past year across six different services. The survey asks people how well or badly they think their government has done at stopping corruption.
For the 2015-2017 version all the values have been assigned the year 2016.
Note: Only valid answers are used when calculating the averages, "Unknown'', ``Don't know'' etc. are excluded.
For the 2003-2013 version, the data for a country is marked as missing if there are less than 100 respondents per year, if there are 100 or more, the value corresponds to the mean of all answers.
The CPI focuses on corruption in the public sector and defines corruption as the abuse of public office for private gain. The surveys used in compiling the CPI tend to ask questions in line with the misuse of public power for private benefit, with a focus, for example, on bribe-taking by public officials in public procurement. The sources do not distinguish between administrative and political corruption. The CPI Score relates to perceptions of the degree of corruption as seen by business people, risk analysts and the general public and ranges between 0 (highly corrupt) and 100 (highly clean).
Note: The time-series information in the CPI scores can only be used if interpreted with caution. Year-to-year shifts in a country's score can result not only from a changing perception of a country's performance but also from a changing sample and methodology. That is, with differing respondents and slightly differing methodologies, a change in a country's score may also relate to the fact that different viewpoints have been collected and different questions have been asked. Moreover, each country's CPI score is composed as a 3-year moving average, implying that if changes occur they only gradually affect a country's score. For a more detailed discussion of comparability over time in the CPI, see Lambsdorff 2005.
Note: In 2012 TI changed the methodology for which the data is not comparable and only data from 2012 and onwards can be compared.
Also, the observation ''Belgium/Luxembourg'' from the 1995 data has been dropped.
The Corruption Perception Index (2022) by Transparency International is licensed under CC-BY-ND 4.0.