I know what you say. I had a crazy game in which I put goods to 50 percent and then afk for 18000 turns. Well, when I came came back, the world’s population had only gotten up to 460 million people. I think that depending of the population you have, this should grow quicker or slower. Example - Porto has 100% population growth and it has 50 thousand habitants. 50000 / 1000 = 50. So it would be
x ( population growth) + ( y (habitants) / ( x * 10) )
Also, depending of the era you are in, population should grow faster or slower. Example, in the dark ages the minimum goods are higher and the population growth goes down. Also, there are lots of illnesses. However, in the modern era the goods are even higher than in the dark ages but the population growth goes up and there are a lot less illnesses.