Always re-read you codices:
So, lots of Eldar. Obviously the figures are estimates, but conservative ones. We know for sure atleast thirty Craftworlds survive. Even if they started with one billion and ended with a tenfold increase that would still be 300bn Craftworlders.Originally Posted by Eldargal
You could argue that 'entire planet's population could mean a relatively sparsely populated colony, but much of the Eldar fluff states the empire was centred on a unknown number Crone worlds and the population was in the trillions.