As we can see, the five countries with the highest scores (and thus perceived as most ‘clean’) are Denmark, New Zealand, Finland, Singapore and Sweden.law enforcement records and audit reports), or perception surveys (e.g. In this entry we discuss data from both sources, and discuss their underlying limitations.As we show, although precise corruption measurement is difficult, there is a clear correlation between ; so available corruption data does provide valuable information that, when interpreted carefully, can both tell us something important about our world as well as contribute to the development of effective policies.The Corruption Perception Index scores countries on a scale of 0-100, where 0 means that a country is perceived as highly corrupt and 100 means that a country is perceived as very clean.The indicator is representative of expert opinion, as it is constructed by taking the averages of various standardized expert surveys, including those from the Bertelsmann Foundation, the World Economic Forum, the World Bank, and many others.This ranks them among the top-ten countries with the highest perception of political corruption.Bribery is one of the most common forms of corruption.The Global Corruption Barometer, also produced by Transparency International, surveys individuals around the world, asking them about their opinions and experiences regarding corruption. The map below shows that everyday people’s perception of the problems associated with corruption correlate with expert opinion (seen in the previous section) about how much corruption there is.The visualization below shows the average national perception of corruption, as rated on a scale of 1 to 5 by respondents asked the question: “To what extent do you think that corruption is a problem in the public sector in this country? However, the correlation is far from perfect, indicating that these two indicators present us with different perspectives.There are, however, some clear exceptions: Myanmar, for example, improved its score from 15 to 29 in the period 2012-2018 (which corresponds to a change in world ranking from 171 to 136); meanwhile, Bahrain’s score fell from 51 to 36.The data visualized above relies on the perception of experts (e.g. Now we analyze data representing the perceptions of everyday people confronting corruption around the world.