> Not horrible as a first approximation, probably, though clearly not "right" either. You really do have to leave any hope of perfectionism at the door when it

> Not horrible as a first approximation, probably, though clearly not "right" either. You really do have to leave any hope of perfectionism at the door when it comes to migration data. Even if record-keeping were consistent, a considerable amount of migration goes unrecorded — mass migration due to environmental disasters or conflict, illegal immigration, etc. There are very few countries that can claim to know the exact number of people within their borders at any given time, let alone where they came from.