population in 2010 Foreign-born people accounted for 9.4% of the EU27 population"
But I do no see why the Eurostat's press release headline merged the number of intra-EU and non-EU "immigrants.
Out of the total 6,5% of the 500 million EU27 population, the 6.5% includes two parts:
a) 2.5% of inta-EU27 "immigrants"
b) 4.0% immigrants from the rest of the world (ie non-EU)
The 4% figure is lower than some would imagine and puts a dent in the complaints re "foreigners" in the EU!
It would be interesting to know how the 2.5% internal migration of the EU27 population (citizens) in 2010 compare with the intra-USA one!