Control of corruption during each prime minister's tenure

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

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Tenures

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Party

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Results

Order

#	Prime minister	In office	Total	Per year
1	DP Abhisit Vejjajiva	17 Dec 2008 – 5 Aug 2011	+3.2 points 2008 → 2011	+1.1 points/yr
2	Prayut Chan-o-cha	9 Jun 2019 – 22 Aug 2023	−1.1 points 2018 → 2023	−0.2 points/yr
3	N Prayut Chan-o-cha	22 May 2014 – 9 Jun 2019	−2.0 points 2013 → 2018	−0.4 points/yr
4	TRT Thaksin Shinawatra	9 Feb 2001 – 19 Sep 2006	−6.8 points 2000 → 2006	−1.1 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 better · World Bank, Worldwide Governance Indicators (GOV_WGI_CC.SC): perceptions of public power used for private gain, petty and grand, a score from 0 to 100 with its 90 % interval · Thailand data · as of Aug 2026.