Does anyone know of a way to estimate the background number of people that would die every day in a campaign setting?

Does anyone know of a way to estimate the higher peaks that a war, famine or plague might cause?

Finally, does anyone know of a way to estimate the number of ghosts that might get resurrected per day or the number that might get pulled off to the True Afterlife by The Calling?

In theory, if people kept dying, but never moved onto the True Afterlife the city of Manifest would get more and more crowded with ghosts over time, but I am going to assume that does not happen, because I am looking for numbers to "make Ghostwalk work" rather than numbers to "tear it down".

I am going to assume that Sean K Reynolds and Monte Cook designed the The Calling to cancel out the number of people coming in, so that the population of ghosts over time was more or less stable. I am going to assume that if you have a plague, famine or war that the population of Manifest would rapidly rise, but that, over a period of time, poor ghosts would gain enough XP to level up enough that if they have not bought a resurrection for themselves, they would be forced to move onto the True Afterlife and the population would start to fall back towards normal levels.

I'm not sure how slow commoner ghosts might level up, and if they could save up enough gold pieces before The Calling got them, but I'm figuring that if I can work out the maths for commoners coming in, and the average time for a commoner to level up to 2nd level, then that would be the time taken for 1st level commoners to exit Manifest via natural causes.

I'm guessing the same sort of logic would cover ghost NPCs that are above 1st level, but that the higher the starting level each ghost would have, the more time it would have in Manifest to either buy a resurrection spell or avoid The Calling. I am assuming that all of this is stable (when there are no wars, famines or plagues) and that there would be some sort of spread of ghosts of various levels. I am assuming that ghosts with levels of standard classes would need to be younger than ghosts with high levels of standard class levels, because living longer would cause ghost NPCs to gain NPCs and move closer towards the point where The Calling got them.

I don't have those numbers or proportions, and sadly, while there are stats for the population of everywhere except Manfest, I can't find any population figures for Manifest itself, but I figure that it

*might*be possible to look at some sort of medieval documentation and see what sort of death rates were happening in the real world...or in different parts of the real world, and then to try to use that to work out a potential range for the number of ghosts living in Manifest.

I've heard of some sources for looking up medieval demographics to estimate the number of people doing specific jobs in cities, towns or villages, but does anyone know of any sources for working out how many people would be born or how many people would die per day?

And are there any real-world sources for the various causes of deaths, as that might help work out percentage tables for use with the Faces of Death rules on pages 11-12?