Workers tend to breed rather well. The speed at which the increase their numbers is dependant of a couple of factors
- free player or premium (growth is slower for free player)
- health index (higher means more people survive infancy)
- population composition (younger people breed better)
- population size (there is a growth curve that is not linear)
- education (higher education means more higher educated people)
1 tip:
This is NOT a game for fast and quick. Things take time, developing countries can take months (real life ones)
I hope this helps a little bit