The RP isn't very statistic based so I'm not putting a lot of emphasis or desire to account for numbers. You can if you want, but I'm not enforcing it.

The point might also be made that often in the case of the period censuses may not often be regular and conducted at times that would answer a question at the moment of the regime at the time. Like if they really needed to know how much money or men they could muster in their defense. Arguably for smaller kingdoms or tribal-oriented states there wouldn't be really any incentive to provide a central census, since either the resources aren't there or groups may move around too much.

It's something I'm not going to stop you from doing, if you want. But I don't place emphasis on doing so.