I did a quick extrapolation of the data for 2015
-Murder, German nationality: 0,72 per 100.000
-Murder, Foreign nationality: 2,51 per 100.000
-Sexual abuse, German nationality: 1,55 per 10.000
-Sexual abuse, Foreign nationality: 3,04 per 10.000
-Sexual assault, German nationality: 0,36 per 10.000
-Sexual assault, Foreign nationality: 1,42 per 10.000
Keep in mind that Western European and East Asian immigrants are usually underrepresented compared to Germans, but Middle Eastern and African immigrants are extremely overrepresented. For example, some more numbers I just calculated according to BKA data from 2015:
-Sexual assault, Afghan nationality: 5,2 per 10.000
-Sexual assault, Iraqi nationality: 5,2 per 10.000
-Sexual assault, Pakistani nationality: 5,1 per 10.000
-Sexual assault, Tunesian nationality: 7,1 per 10.000