Within the western European network marked differences occur in rates of immigration and in the directions of links between origin and destination countries. France and west Germany both have similar numbers and proportions of immigrants but draw from different sources. In great Britain, levels of immigration have remained remarkably low and sources have generally differed from those of continental countries. Patterns have changed over time too. For example, in the later 1950s the Italian flow switched from France to west Germany and Portuguese and Spaniards were sucked into France instead. In recent years rates of inflow and outflow have varied by national group: in west Germany after 1975 inflows of Turks and Italians rose sharply in comparison with other groups and though falls in outflow were common to all nationalities, again there were some divergences of experience ( Salt, 1985 )