Electoral democracy index during each prime minister's tenure
Every prime minister since 1991, ranked by how the electoral democracy index changed from their first day in office. Politare shows what happened during a tenure; it does not claim the office-holder caused it.
| # | Prime minister | In office | Total | Per year | Chart |
|---|---|---|---|---|---|
| 1 | DP Chuan Leekpai | 23 Sep 1992 – 13 Jul 1995 | +14.1 points 1992 → 1995 | +4.7 points/yr | |
| 2 |  Prayut Chan-o-cha | 9 Jun 2019 – 22 Aug 2023 | +12.5 points 2018 → 2023 | +2.5 points/yr | |
| 3 | DP Abhisit Vejjajiva | 17 Dec 2008 – 5 Aug 2011 | +6.0 points 2008 → 2011 | +2.0 points/yr | |
| 4 | DP Chuan Leekpai | 9 Nov 1997 – 9 Feb 2001 | +2.5 points 1997 → 2000 | +0.8 points/yr | |
| 5 | TRT Thaksin Shinawatra | 9 Feb 2001 – 19 Sep 2006 | −27.4 points 2000 → 2006 | −4.6 points/yr | |
| 6 | N Prayut Chan-o-cha | 22 May 2014 – 9 Jun 2019 | −27.6 points 2013 → 2018 | −5.5 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, V-Dem's 0 to 1 index times 100 · V-Dem Institute, V-Dem dataset v16 (v2x_polyarchy): the electoral democracy index, free and fair elections with wide suffrage and the freedoms of association and expression that make them count, as V-Dem's country experts rate them, with V-Dem's confidence interval; the 0 to 1 index times 100 · Thailand data · as of Aug 2026.