That's really useful data. As always with statistics, I've thought about what factors could influence the data. One is population, so the obvious thing would be

That's really useful data. As always with statistics, I've thought about what factors could influence the data. One is population, so the obvious thing would be to weight the number of visas issued (which should be proportional to the number of visas applied for if it's a lottery) with the population of that country, specifically the number of people with bachelor degrees or higher. But even with weights controlling for educated population, from rough calculations I've done, H1-B visas seem to be issued disproportionally often to Indian nationals. If it were somehow possible to see the average H1-B wage per nationality, that would also be very interesting. But neither would answer why that's the case, a simple (and probably wrong explanation) could be that Europeans are simply less likely to wait for H1-B visas given the benefits inherently provided in those countries. (Edit: What I mean is you still can't tell if this disproportionality is a good or bad thing, only that there is such a disproportionality.)