I am also surprised but you can check and it does indeed seem the majority (90%+) that apply for citizenship every year are accepted... I would hazard a guess

I am also surprised but you can check and it does indeed seem the majority (90%+) that apply for citizenship every year are accepted... I would hazard a guess this is because of their population crisis, maybe? They have one of the oldest populations in the world and their birth rate is still less than 1.5. That's a recipe for social and economic disorder, with current levels of automation.