I noticed that in planets with a few population like 0,10 billion the population didn't grew 0,1 billion for week as stated in wikipedia.I really like this feature because it's very realistic that if you have small population it shouldn't grow as if you have 5 billion.But what is the threshold which below that population doesn't increase at normal levels (0,1 billion) but at a great slower rate not taking in account morale modifiers?