"...Turks made up the greatest number of new Germans in 2006, as in previous years, with around 33,500 changing their nationality. Around 12,600 former Serbian and Montenegrin nationals were in second place, 6,940 Poles in third, and 4,690 people from Russia in fourth. They were followed by around 4,550 Ukrainians, 4,310 Israelis, 3,690 Iraqis and 3,550 Moroccans."
More:German Citizenship Numbers Spike | Germany | Deutsche Welle | 24.07.2007