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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. More than two-thirds of countries score below 50 on this year’s CPI, with an average score of just 43.  

It reveals that the continued failure of most countries to significantly control corruption is contributing to a crisis in democracy around the world. While there are exceptions, the data shows that despite some progress, most countries are failing to make serious inroads against corruption. 

See previous CPI results.

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Index 2018

CPI Scale from Highly Corrupt to Very Clean

Highlights

Improvers

  • Estonia
  • Côte D’Ivoire
  • Senegal
  • Guyana

Decliners

  • Australia
  • Chile
  • Malta
  • Turkey
  • Mexico

Countries to watch

  • United States of America
  • Czech Republic
  • Brazil

Corruption is much more likely to flourish where democratic foundations are weak and, as we have seen in many countries, where undemocratic and populist politicians can use it to their advantage.

Delia Ferreira Rubio
Chair
Transparency International

The CPI in Detail

The full data set

Since its inception in 1995, the Corruption Perceptions Index, Transparency International’s flagship research product, has become the leading global indicator of public sector corruption. 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 2018 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). 

# Country Region 2018 2017 2016 2015

Methodology

The methodology follows four basic steps: selection of source data, rescaling source data, aggregating the rescaled data and then reporting a measure for uncertainty. 

Relevant Topics

Press Release

The 2018 Corruption Perceptions Index (CPI) reveals that the continued failure of most countries to significantly control corruption is contributing to a crisis of democracy around the world.

Full Press Release: Englishعربي | Español | Français | Русский 

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الشرق الأوسط وشمال أفريقيا: انتشار الفساد في ظل ضعف المؤسسات وتراجع الحقوق السياسية

كشف مؤشر مدركات الفساد 2018 عن صورة قاتمة لواقع الشرق الأوسط وشمال أفريقيا حيث أن معظم بلدان المنطقة قد أخفقت في مكافحة الفساد على الرغم من أن قلة قليلة من البلدان قد أحرزت تقدما تدريجيا.

Afrique subsaharienne:Les régimes non démocratiques sapent les efforts de lutte contre la corruption

L’Indice de perception de la corruption (IPC) présente cette année un tableau bien sombre de l’Afrique : seuls 8 pays sur 49 obtiennent un score supérieur à 43 sur les 100 points que compte l’Indice. Malgré l’engagement pris par les dirigeants africains de faire de 2018 l’Année africaine de lutte contre la corruption, les avancées concrètes se font encore attendre.

Trouble at the top: why high-scoring countries aren’t corruption-free

For the third year running, the top seven countries in the Corruption Perceptions Index 2018 consist of the four Nordic nations – Denmark, Finland, Sweden and Norway – plus New Zealand, Singapore and Switzerland. Yet that doesn’t mean that these countries are corruption-free.

Americas: el debilitamiento de la democracia y el auge del populismo

Con una puntuación media de 44 sobre 100 durante tres años consecutivos en el Índice de Percepción de la Corrupción (IPC), las Américas continúa sin lograr avances significativos en la lucha contra la corrupción.

Conflict at the bottom

As in previous years, many of the countries near the bottom of the 2018 Corruption Perceptions Index have been severely affected by violent conflict in recent years. Why is this the case, and what does it tell us?

Americas: weakening democracy and rise in populism hinder anti-corruption efforts

With an average score of 44 for three consecutive years, the Americas region continues to fail in making any serious inroads against corruption. The number of poor performing countries in the Americas region should come as no surprise given the challenges to the democratic systems and diminishing political rights across North, South and Central America by populist and authoritarian leaders.

Sub-Saharan Africa: undemocratic regimes undermine anti-corruption efforts

This year’s Corruption Perceptions Index (CPI) presents a largely gloomy picture for Africa – only eight of 49 countries score more than 43 out of 100 on the index. Despite commitments from African leaders in declaring 2018 as the African Year of Anti-Corruption, this has yet to translate into concrete progress.

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