Speaking mathematically, 1 out of 100,000 people have the potential to awaken their Aura then. Considering population size and whether or not society grants equal opportunities to all (unlikely), the actual ratio is probably even more dire. How many of those Potential Aura-Farmers were actual farmers who simply daydreamed of cutting swallows, after all?

Guess also meaningful to ask about general population size of the kingdom n all. And how much of it was wiped out by the demons before our characters died.