Which is the happiest country in the world ?

We always have the knowledge of the poorest country in the world or the country with highest population but we don't give much attention to the happiest country that is different of the richest country in the world. Not every rich country is happy. There are certain level of Happiness on which every country is evaluated annually so Which is the most happiest country in the world?
We always have the knowledge of the poorest country in the world or the country with highest population but we don't give much attention to the happiest country that is different of the richest country in the world. Not every rich country is happy. There are certain level of Happiness on which every country is evaluated annually so Which is the most happiest country in the world?