Does anyone have any sources mentioning the percentages of citizens at various times, or the populations of citizens and corresponding total populations so I can calculate percents? I looked at dozens of sources online without finding this kind of information.
closed as too broad by TheHonRose, Fred, Semaphore♦, Medi1Saif, CGCampbell Feb 15 '16 at 12:10
Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.
I found two estimations about the number of slaves for the 2nd and 1st centuries BC.
- P. Brunt  estimates there were 3 000 000 slaves in a total population of 7 500 000 people.
- J.C. Dumont  estimates that at least 32% of the population was in slavery.
From these numbers, we deduce that roughly 60% of the population were free. Halve this proportion to exclude women, further exclude children, and the proportion drops to 20-25% of free men (I have no precise idea for the proportion of children). Not all of them were citizens, but at least we have an upper bound.
: Italian Manpower, 225 BC -- AD 14, Oxford, 1971
: Servus. Rome et l'esclavage sous la République, Rome - Paris, 1987