It would actually depend on where in Germany you are going, but since the first Turkish “Gastarbeiter” (among others, quite some nationalities) came to West Germany over 60 years ago, it is not uncommon to meet people of Turkish descent there. (East Germany not so much, they had Vietnamese workers but mostly deported them back to Vietnam after the re-unification.) Combine these Gastarbeiter (and the three generations after them) with a declining native birth rate and an influx of asylum seekers, and it could well be 40-50% all together.

The big question is what the problem is here, and the answer is that the far right wants it to be a problem so they can come to power. So they’ll bloody make it a problem and try and sabotage any solutions. These last lines are my personal opnion obviously.