Yes definitely an overestimation of population but I have also heard on internet forums that some Serbs give birth and register their births in RS then return home to K10, due to the difference in birth/school data.
great guess you're right haha. here's the town of posušje. old data, but the canton's birth rate has only increased since. i think it comes down to the mentality of people, herzegovinian croats marry younger and are way more religious/trad than croats from croatia.
