Cobbled together from here,   here,  
and here:

Year    left    arrived    net
1989:    -388400    5100    -383300
1990:    -395343    36200    -359143
1991:    -249743    80267    -169476
1992:    -199170    111345    -87825
1993:    -172386    119100    -53286
1994:    -163034    135774    -27260
1995:    -168336    143063    -25273
1996:    -166007    151973    -14034
1997:    -167789    157348    -10441
1998:    -182478    151750    -30728
1999:    -195530    151943    -43587
2000:    -214456    153179    -61277
2001:    -192002    94441    -97561
2002:    -176700    95876    -80824
2003:    -155385    97035    -58350
2004:    no data yet
all:    -3186759 1684394 -1502365

So it must be over 3.3 million by now.


_{*Lunatic*, n.
One whose delusions are out of fashion.}

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.