What professions are needed in what countries?
 

The effort of discovering which countries need (and welcome) more workers of a certain profession is a research project that's too tedious for an individual. Where's a bar chart that plots unmet demand for aerospace software engineers (one bar for each region), for example? Is anything like this compiled and published? It's driving me nuts trying to assemble this information myself, from scraps of information out on the web that's probably unreliable.

What expats also need is an ongoing study that ranks the immigration policies of the developed nations, by profession, since that's a rapidly changing variable as well.