the majority from Asia and Africa. 37 per cent of all immigrants in France live in the Paris region. The first wave of international migration to Paris started as early as 1820 with the arrivals of German peasants fleeing an agricultural crisis in their homeland. Several waves of immigration followed continually until today: Italians and central European Jews during the 19th century; Russians after the revolution of 1917 and Armenians fleeing genocide in the Ottoman Empire; colonial subjects during World War I and later; Poles between the two world wars; Spaniards, Italians, Portuguese, and North Africans from the 1950s to the 1970s; North African Jews after the independence of those countries; Africans and Asians since then. The Paris metropolitan region or "aire urbaine" is estimated to be home to some 1.7 million Muslims, making up between 10–15 per cent of the area's population. However, without official data, the margin of error of these estimates is extremely high as it is based on one's country of birth (someone born in a Muslim country or born to a parent from a Muslim country is considered as a "potential Muslim"). According to the North American Jewish Data Bank, an estimated 310,000 Jews also live in Paris and the surrounding Île-de-France region, an area with a population of 11.7 million inhabitants. Paris has historically been a magnet for immigrants, hosting one of the largest concentrations of immigrants in Europe today. Immigrants and their children in departments of Île-de-France (Paris Region) Anch National Institute for Statistics and Economic Studies, responsible for the production and analysis of official statistics in France, 20 per cent of people living in the city of Paris are immigrants and 41.3 per cent of people under 20 have at least one immigrant parent. Among the young people under 18, 12.1 per cent are of Maghrebi origin, 9.9 per cent of Subsaharan African origin and 4.0 per cent of South European origin. About four million people, or 35 per cent of the population of the Île-de-France, are either immigrants (17 per cent) or have at least one immigrant parent (18 per cent). (source : Insee, EAR 2006) Reading: 436 576 immigrants live in Paris, representing 20% of Parisians and 22.4% of immigrants in Île-de-France. 162 635 children under 20 with at least one immigrant parent live in Paris, representing 41.3 per cent of the total of children under 20 in Paris and