According to the results of the German population extrapolations, 8.7 million people were living in Germany in 2015 who do not have German nationality. This corresponds to a share in the population in Germany of 10.5%. Unlike the German population, the size of which is only determined by the demographic processes of birth development, mortality development and migration (immigration and emigration), the size of the foreign population can also be reduced by means of naturalisation. This becomes particularly clear in the younger age groups of foreigners in Germany, which have been decimated since 2000 particularly by the fact that children of foreign parents receive German nationality at birth if the parents meet specific requirements (at least one parent has been lawfully resident in Germany for eight years and has an indefinite right of residence). The migration processes also have a much greater influence on the size of the population among the foreign population than among the German population.