Wikipedia corruption index
The Corruption Perceptions Index (CPI) ranks countries and territories based on how corrupt their public sector is perceived to be. It is a composite index – a combination of polls – drawing on corruption-related data collected by a variety of reputable institutions. The CPI reflects the views of observers from around the world. Political corruption is a persistent phenomenon in Nigeria.In 2012, Nigeria was estimated to have lost over $400 billion to corruption since independence. In 2018 the country ranked 144th in the 180 countries listed in Transparency International's Corruption Index (with Somalia, at 180th, being the most corrupt, and Denmark the least). The index, which ranks 180 countries and territories by their perceived levels of public sector corruption according to experts and businesspeople, uses a scale of 0 to 100, where 0 is highly corrupt and 100 is very clean.