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
Over 45% of respondents used Spanish to address their parents (versus 36% who choose Catalan). This is attributed to extensive migration from other areas in Spain during the second half of the 20th century, as a consequence of which many Catalans have one or both parents born outside Catalonia. However, a majority (52.6%) used Catalan with their children (compared to 42.3% for Spanish). This can be attributed to some Spanish-speaking citizens shifting from their native language to Catalan at home.