I'm in the mood to create a demographics section for the UNT so you guys know the percentages of every race (with other minor races all grouped into one). 5% is probably very large for a single race. I imagine the top 10 make up 50% of the population. The top would be seen disproportionately more, though, in things like the military. If your race only has a few billion then you're not sending a large task force off planet to join UNT forces.