This poll annoyed me so much I googled it. It's just a really shitty poll. There is no reason to believe the 5 listed jobs is a subset of the answers. This is an infographic summarizing a single question from a survey that seems to be commissioned by LEGO.

Article from the "Harris Poll"

I couldn't find like, an academic paper describing the poll. There's no methodology for it I can find. It's just some corporate fluff piece, frankly.

So I guess 3% if these are the only 3 countries included

Yep, only 3 countries. This is just a trash poll.