True, but I'm assuming that the relative percentages of foreign-born residents gives a pretty decent indication of the relative percentages of second-generation foreign-born as well. (Of course, there could be variations in birth rate based on where people are immigrating from, how long they're planning to stay, what kind of cultural network they get plugged into in the new country, etc.)
http://www.mamashealth.com/relationships/moveon.asp This might help you guys with this Neven and Rossi thing.