“Happiness report: Finland is world's 'happiest country' – UN” http://www.bbc.com/news/world-43414145
The report relies on asking a simple, subjective question of more than 1,000 people in more than 150 countries.
"Imagine a ladder, with steps numbered from 0 at the bottom to 10 at the top.
"The top of the ladder represents the best possible life for you and the bottom of the ladder represents the worst possible life for you. On which step of the ladder would you say you personally feel you stand at this time?"
The average result is the country's score - ranging from Finland's 7.6 to Burundi's 2.9.