It's Togolese, by the way, just in case you were wondering how to put that phrase. In the same way that people who live in Congo are Congolese.
Your point about relativity is a good one although I think regardless of that, money makes you more comortable and arguably therefore happier regardless of what's going on in other countries.
I'd also like to see a bar chart with the different religions also, i.e.countries that are predominantly Christian in one bar, Muslim in another bar, etc. and then compare that with happiness and then find a way to mix GDP in there somehow.
But in the end the eternal question will always be, which is the cause and which is the effect? Did happiness cause production, did production cause religion, did religion cause happiness?