As you know, the happiness scale by itself is meaningless - culturally skewed toward Western concepts of happiness. But observing the change in reported happiness s fair game because we are comparing the same people to themselves 12 years earlier. Jordon and Lebanon have a lot going on that isn't covered by the world media, which tend to just view them in terms of how they fit into the Islamicist, Zionist, Palestinian mess.
Any outsider can easily see the mental illness plaguing North Americans, accelerated by social media and drug use (legal and otherwise).
I was surprised to see Bangladesh there, considering the real economic improvements they have seen in the past 10 years.