Atleast that is the way I have allways come in contct with the word. People living in another country for a short time to further their career/learn things.
Only after seeing pakistan so high (Which I tried after getting india after just trying the big countries) I realised you meant the other way around. Countries of which the most people have left, not countries where most people have moved to, which it seemed to describe (to me, when reading the description)
(Because the country they move to, "has people living in another country than they were born in".)
(I realize Wikipedia wasn't the source but the discrepancy still seems odd to me... unless Wikipedia measures expats differently then the UN)