The happiness level of countries depends upon these three categories i.e. political stability, economic data and social foundation. It is not an easy task to maintain the above three categories in same order. Hence to make their country the happiest in the world, every single person has to work upon it. Financial conditions of a market should be stable to increase the economic data.
The development and healthy environment can raise the social foundation. Last but not the least to add your country in top 10 lists, good public services are required.
Population: 23.78 million (2015)
Population: 9.799 million (2015)
8. New Zealand
Population: 4.596 million (2015)
Population: 35.85 million (2015)
Population: 16.94 million (2015)
Population: 5.482 million (2015)
Population: 330,823 (2015)
Population: 5.676 million (2015)
Population: 5.196 million (2015)