not taken into account. In 2005, 18.1% of young people under 18 were of foreign origin (at least one immigrant parent) in France including 13.5% of non-European origin. Ile-de-France has the highest proportion at about 37%. People under 18 of Maghrebi, Sub-saharian and Turkish origin became a majority in several cities of Ile-de-France (Clichy-sous-Bois, Mantes-la-Jolie, Grigny, Saint-Denis, Les Mureaux, Saint-Ouen, Sarcelles, Pierrefitte-sur-Seine, Garges-lès-Gonesse, Aubervilliers, Stains, Gennevilliers et Épinay-sur-Seine) and in several arrondissements of Marseilles. In Grigny, 31% of young people are of Sub-saharian origin. Between 2006 and 2008 about 22% of newborns in France had at least one foreign-born grandparent (9% born in another European country, 8% born in Maghreb and 3% born in another region of the world). In 2010, 27.3% of the 802,000 newborns in metropolitan France had at least one foreign-born parent. About one quarter (24%) of all the newborns had at least one parent born outside of Europe including about 17% from Africa (11% from Maghreb and 6% from Subsaharan Africa). Posted workers of Europe Regarding the country of origin of "posted workers", the same document states the origin of the posted workers: Poles represent the largest contingent of employees posted to France (18% of the total), followed by the Portuguese (15%) and Romania (13%). The majority of these employees, about 60% comes from the historical countries of the European Union, but the share from the new Member States "EU" is growing very rapidly, and the nationals of countries outside "EU "also increases. Immigration per region In France, the three largest cities (Paris, Lyon and Marseille) also attract the largest share of immigrants to the country. According to a study of the INSEE, in France, Immigrants are more concentrated in urban areas than the native population. 90.1% of the immigrant population is located in urban areas which is significantly more than the proportion for the native population, 81.9% of them living in urban areas. In 2012, 38.2% of the total immigrant population lived in the Parisian urban area compared to 4.1% and 3.1% respectively for Lyon and Marseille. Île-de-France The region with the largest proportion of immigrants is the Île-de-France (Greater Paris), where 40% of immigrants live. According to INSEE, French National Institute for Statistics and Economic Studies, responsible for the production and analysis of official statistics in France, about 35% of people (4 million) living in Île-de-France, are either immigrant (17%) or born to at