apparently my 2606934 pop lvl 72 planet (very 1st colony, built from 2 ships.. heh)
Interesting, my lvl 72 planet formed from 1 ship has 1468574 people on it.
And I have a level 58 planet from 1 ship that has 800,000 people (it's been MCed and Food Subsidies for a while).
Obviously, if you ever made any ships on the planet (I did), that effects population forever, as growth is a function of existing population.
But... I'm beginning to wonder... you don't suppose tax rate and population growth rate might be inversely related, do you?