Languages of Catalonia
The main cause of Spanish and Catalan social bilingualism in modern Catalonia was large-scale migration from the rest of Spain during the 20th century, as Catalonia started a significant industrialization which demanded an increased workforce from elsewhere. Spanish has historically been spoken among a minority of civil servants born in other regions in Spain and among segments of the wealthiest bourgeoisie. Spanish has also been spoken as a second language by most Catalans, as it has been the only official language over long periods since the eighteenth century.
Catalonia
Since the Statute of Autonomy of 1979, Aranese (a dialect of Gascon Occitan) has also been official and subject to special protection in Val d'Aran. This small area of 7,000 inhabitants was the only place where a dialect of Occitan has received full official status. Then, on 9 August 2006, when the new Statute came into force, Occitan became official throughout Catalonia. Occitan is the mother tongue of 22.4% of the population of Val d'Aran. Catalan Sign Language is also officially recognised.