Released recently:
http://www.politi.no/pls/idesk/docs/...tioslo2007.pdf
72.8% of rapers in 2007 had foreign background, 63.2% in 2004, 53% in 2001.
Considering that 23.8% of population in Oslo area (where most rapes happen) have foreign background, a foreigner is 8.55 times more likely to commit a rape crime.
Men of African background have increased their "share" the most, from 10% in 2001, 19.1% in 2004 and now 30.5% in 2007. This is partly because there are more Africans in gang rapes.
73% of victims in 2007 had Norwegian background.