This article prompted me to look into something I've been interested in for a while - what's the skilled vs unskilled breakdown in immigration for various count

This article prompted me to look into something I've been interested in for a while - what's the skilled vs unskilled breakdown in immigration for various countries? Canada and Australia, as far as I understand it, do emphasize skilled immigration, though not exclusively (Australia has a points test that I think the US would do well to emulate). I read a lot of praise for Germany's startup visa, but I'm also reading about hostility toward immigrants, boats of poor, uneducated (and most likely) migrants sinking off the coast of Italy or the shores of Australia... there's a lot of anecdote here (stories like that attract a lot of attention - but are they typical?). A really broad look would be interesting to read about. I actually haven't been able to find much about this, though - at least not on a nation-by-nation basis. It does sound like a difficult bit of data analysis, because the numbers themselves are tough to interpret (for example, would migration within the EU count as immigration, whereas Californians moving to Texas wouldn't?). Anyone got any good links?