 The 1970s to the mid-1980s were years of general urban and social decay marked by social and political unrest and violence.In 1979, the first democratic municipal elections were held, won by the Basque Nationalist Party, who held office along with splinter party Eusko Alkartasuna (Basque Solidarity) until 1991.The Spanish Socialist Workers' Party's Odon Elorza took over as mayor from 1991 until 2011, when he was defeated unexpectedly by Juan Carlos Izagirre (Bildu) in elections.