Global non-governmental organization Transparency International included 21 Arab countries on its 2018 Corruption Perception Index (CPI), which measures the perceived level of public sector corruption in 180 countries worldwide. The rankings are based on scores that range between zero and 100 points, with lower scores reflecting economies perceived as more corrupt. The UAE was perceived as the least corrupt Arab country and ranked in 23rd place globally. It was followed by Qatar (33rd), Oman (53rd), Jordan and Saudi Arabia (58th each), and Morocco and Tunisia (73rd each); while Libya (170th), Sudan (172nd) and Yemen (176th), Syria (178th) and Somalia (180th) were perceived as the most corrupt countries in the region. Arab countries received an average score of 34 points in 2018 relative to 33 points in the 2017 survey, lower than the global average of 43 points. The Arab economies' average score was higher than that of Sub-Saharan Africa (32 points), but it was lower than the average scores of the European Union & Western Europe (66 points), Asia Pacific and the Americas (44 points each), and Eastern Europe & Central Asia (35 points). Also, Gulf Cooperation Council (GCC) countries received an average score of 52 points in the 2018 survey compared to 50 in the 2017 survey, while non-GCC Arab countries had an average score of 27 points, unchanged from the 2017 survey. 
Source: Transparency International, Byblos Research