Buddhist Bhutan life influence for hundreds of years. Therefore, it is no surprise that Buddhist influence, to explain the word "happy" in the GNH concept.
Buddhism has influenced the lives of the people of Bhutan for several hundred years. It's not surprising that religion will influence explains the word "happy" in the GNH.
Buddhism influenced the lives of the Bhutan for hundreds of years. It is not surprising that Buddhism would influence to define "happiness" in the concept GNH.