Any idea if a significant number of the west-east migrants are returning E. Germans? E.g. Students, people who moved but didn't find a job or whatever? I presume that most aren't considering the employment situation in the East. On the other hand plenty of W.German Beamte moved east. You've also gotten some internal mixing in Berlin with lots of W. Berliners moving to the suburbs or to the fun neighbourhoods in central E. Berlin.