According to the World Happiness Report 2015, published by the Sustainable Development Solutions Network, the 10 happiest countries are:
9. New Zealand
In the report, leading experts across fields - economics, psychology, survey analysis, national statistics, health, public policy and more - describe how measurements of wellbeing can be used to effectively assess the progress of nations. The reports review the state of happiness in the world today and show how the new science of happiness explains personal and national variations in happiness. They reflect a worldwide demand for more attention to happiness as a criteria for government policy.