Didnt know Qatar scored so high on GDP per hours worked metric, but I guess they dont measure hours worked in construction as that one is largely immigrants working in unsafe conditions with confiscated passports. Source - the book Inside Qatar.
But that's not entirely fair, since Africa to Europe may mean risking your life on a tiny boat, but Mexico to US is at least a land border.
Also UK gets it's share of life risking boats.
I guess Australia was the winner on this, until they took drastic measures to get people to stop risking their lives in tiny boats.