Resource Per Minute Counter - Concept

It would be really useful to know how many of each resource you are generating within a given time-frame.

For example: If I have 7 on gold, the gold resource bar would show underneath it how much I am getting per second/30/60 seconds - depending on my customization. This would really help with knowing how many villagers to have on each resource, so that eco can be better balanced.

Does anyone know of a way to do this?