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.
Languages of Catalonia
According to Ethnologue, about 18,000 deaf Catalans use Catalan Sign Language (LSC, "Llengua de signes catalana"). Since, like other deaf sign languages, LSC has no generally used written form, there is no literacy data.