#17 :
This Naxillian independent's population was greatly augmented by a recent influx of pinko ugnaris from the northwest, but still had not built all of his facilities after many years. Also, when you decide to take over an independent, make it only those which are high planet size and quality, not just the nearest to your troop ships. There were about 30 independents which I should never have conquered in this game. Live and learn. Try to take all of those with carbon fiber, also very large and high quality or very near an AI empire's home world. Alternatively set your victory conditions for an economy only half the percentage of the victory conditions for territory and population.