This does need to be further split I think. It looks like both "Very happy" and "rather happy" both count equally, when they are fairly different statements. I imagine most people in most cultures would generally say "Yeah, I'm ok" rather than admit they aren't doing super well. So I'm not sure how useful this data is like this.

I'd also question the translations of "very happy" etc. Depending on how they are translated it could have much more extreme connotations in some languages.

This isn't me assuming this is a "fake" or whatever, just that their methodology is a little lacking for my tastes.

And also this has some real "The international community (plus a view others)" vibes.