Corruption perceptions index during each president's tenure

Every president since 1991, ranked by how the corruption perceptions index changed from their first day in office. Politare shows what happened during a tenure; it does not claim the office-holder caused it.

#	President	In office	Total	Per year	Chart
1	Moon Jae-in	10 May 2017 – 10 May 2022	+9.0 points 2016 → 2021	+1.8 points/yr
2	Yoon Suk Yeol	10 May 2022 – 4 Jun 2025	+2.0 points 2021 → 2024	+0.7 points/yr
3	Park Geun-hye	25 Feb 2013 – 9 Dec 2016	−3.0 points 2012 → 2016	−0.8 points/yr

Sorted by total, highest first. Every row is indexed to the last count complete before the first day in office ("from" marks a start that had to move because that count had no data, or because the period cut it); Levels are per cent changes, rates are differences in points; "per year" compounds levels and divides rates. Tenures with under 12 months, or under three observations, are left out. points, 0 to 100, higher is cleaner · Transparency International, Corruption Perceptions Index (CPI score): perceived public-sector corruption as business people and country experts rate it, comparable from 2012, the score as TI publishes it with its confidence interval · South Korea data · as of Sep 2026.