Switzerland top of the world for happiness

Switzerland is the world's happiest country, according to the United Nations happiness index .

The third World Happiness Report quantifies happiness in 158 countries.

Korea was ranked 47th, falling six places from last year. Japan was 46th and China 84th.

Iceland was second, followed by Denmark, Norway and Canada.

The top 10 "unhappy" nations include Togo, Burkina Faso and Burundi.

North Korea was excluded from the report.