Slightly off-topic but Gallup, in partnership with the UN, Oxford University etc, have produced a World Happiness Report to coincide with UN’s International Day of Happiness...
https://www.gallup.com/analytics/349487/world-happiness-report.aspx
I think it's based on evaluations of their residents i.e., an opinion poll with a lot of additional analysis about satisfaction with political process, life expectancy, GDP, household size, individual isolation etc.
I was largely just interested in the ranking of countries. The UAE ranks above Germany, UK and the USA.
1. Finland
2. Denmark
3. Iceland
21. UAE
22. Germany
23. UK
24. USA
146. Sierra Leone
147. Afghanistan