Source: School of Psychology, University of Leicester

My comments are italicized:

The 20 happiest nations in the World are:

1. Denmark
2. Switzerland – figures
3. Austria
4. Iceland
5. The Bahamas – I can see that (pretty much any island except maybe Haiti)
6. Finland – really? Finland is leading in suicides
7. Sweden – same here: they’re happy despite not even getting enough sunlight?
8. Bhutan
9. Brunei – no surprise there: sun and money
10. Canada – ooookay
11. Ireland
12. Luxembourg
13. Costa Rica
14. Malta
15. The Netherlands
16. Antigua and Barbuda
17. Malaysia
18. New Zealand
19. Norway
20. The Seychelles

Other notable results include:

23. USA
35. Germany
41. UK
62. France
82. China
90. Japan
125. India
167. Russia

The three least happy countries were:

176. Democratic Republic of the Congo
177. Zimbabwe
178. Burundi