The Corruption Perceptions Index (CPI) is an index published annually by Transparency International, a German registered association, since 1995. It scores and ranks countries by their perceived levels of public sector corruption, as assessed by experts and business executives. The CPI generally defines corruption as an "abuse of entrusted power for private gain".
From 1995 to 2011, the index was scored on a scale of 10 to 0. Since 2012, the Corruption Perceptions Index has been ranked on a scale from 100 (very clean) to 0 (highly corrupt).