First language of sons and daughters aged 15 years or younger, depending on the language competence of the parents. Euskal Herria (%).

The Sociolinguistic Survey tries to deepen the knowledge, use and family transmission of Basque, as well as promote it. The aim of this survey is to obtain official statistical information on the use of linguistic interaction between people. It is performed every five years to the population over 15 years. More information on the https://www.euskadi.eus/estadisticas-del-departamento-de-cultura-y-politica-linguistica/web01-s2kultur/es/ departmental statistical portal.《社会语言学调查》（Sociolinguistic Survey）旨在深化巴斯克语（Basque）的认知、使用与家庭传承，并推动其推广。 本次调查的目标是获取关于人际语言互动使用情况的官方统计信息。 该调查每五年面向15岁以上人群开展一次。 更多相关信息可访问该部门统计门户网站：https://www.euskadi.eus/estadisticas-del-departamento-de-cultura-y-politica-linguistica/web01-s2kultur/es/