“…More precisely, for each place of residence in 1999, the data indicates the proportion of the population living in the same municipality in 1990, and details of the origins of the inhabitants from another municipality. The social deprivation of the various municipalities was assessed using the quintiles of the French version of the European Deprivation Index [15]. With respect to the place of residence in 1999, we thus determined for each quintile of deprivation, the distribution of the quintile of deprivation of the municipalities where people lived in 1990.…”