The index offers an annual snapshot of the relative degree of corruption by ranking countries and territories from all over the globe. In 2012, Transparency International revised the methodology used to construct the index to allow for comparison of scores from one year to the next. The 2019 CPI draws on 13 surveys and expert assessments to measure public sector corruption in 180 countries and territories, giving each a score from zero (highly corrupt) to 100 (very clean).
The Corruption Perceptions Index 2019 reveals a staggering number of countries are showing little to no improvement in tackling corruption. The report also suggests that reducing big money in politics and promoting inclusive political decision-making are essential to curb corruption.