6-8 are proportional too (Netherlands, Norway and Luxembourg - the latter of which allows noncitizens to vote!).

9 is Switzerland which has a 2 round run off system + some direct democracy.

10 is Australia, a run-off system

11 and 12 are new Zealand and Costa Rica which are proportional

13 is Kuwait which has Single Non-Transferable Vote (like fptp but with multiple winners)

14 is austria, with another 2 round system.

Most of them also have compulsory voting.

The next electoral system that isn’t at least partially proportional or 2 round run off is the UK at 20. The southern facists are at 23, much higher than I expected to be honest.

Here’s the full ranking, they use a 3 year rolling average.

Gallup polling data from 143 countries for the past three years, specifically monitoring performance in six particular categories: gross domestic product per capita, social support, healthy life expectancy, freedom to make your own life choices, generosity of the general population, and perceptions of internal and external corruption levels.

In order to properly compare each country’s data, the researchers created a fictional country—christened Dystopia—filled with “the world’s least-happy people.” They then set Dystopia as the rock bottom value in each of the six categories and measured the scores of the real-world countries against this value.