How much population does each unit use?

So I haven’t got a chance to play Halo Wars 2, and I know the beta is ending today, but I’m still DYING to know about the population restrictions. It appears as though the highest population you can have is 80, but is that depending on how many bases you control, or is it depending on upgrades you buy, like in the original Halo Wars? Also, how many population slots does each unit use? Marines in the original Halo Wars used 1 population slot, but it appears as though they use WAY more in Halo Wars 2. Can somebody PLEASE give me a list of the population counts for each unit?