A solitary Buddha occurs in one in a million of the human population: please correct me if that's how often the vehicle occurs -- though I struggle to completely understand the concept of a "solitary" seed or fixed yana. Either way, that one million figure is -- I think -- an expression of how it is more unique than arhatship.
Or, have I invented the statistic in bold? Anyway:
[a]s of 2016 Thailand had 39,883 wats (temples). Three hundred-ten are royal wats, the remainder are private (public). There were 298,580 Buddhist monks, 264,442 of the Maha Nikaya order and 34,138 of the Dhammayuttika Nikaya order. There were 59,587 Buddhist novice monks.
Thailand's population is about seventy million, which works out, if you ignore 'turnover', as one in two hundred being monks.
So that, depending on how you understand the numbers in the first paragraph, suggests in monks, no less than one in a thousand are already arhats. Likewise, assuming they don't get stuck on the first step, in which case more still, about one in a hundred are stream winners.
Is that completely wrong?
Does it make sense, do you know, to say that there are e.g. three thousand sages in Thailand? Three hundred saints?
How does it compare with success in the English speaking nations?