I've played several games of Civ 5 with the Gods and Kings expansion, and it seems like every game has involved a similar cast of characters (Austria, Sweden, Byzantium) as well as many of the new natural wonders (the ones that give faith).
This was interesting to see the new content, but now it is getting a bit repetitive. Am I correct in thinking that expansion content is more likely to appear than non-expansion content? Is there some way to modify this so that everything is equally likely?