30641 West Frisian 100000 647,280 415,000 within Friesland; 350,000 mother tongue speakers. No reliable source is available for native speakers worldwide. Good or very good Frisian language proficiency in the province of Friesland is at 85% for understanding the language, 64% for speaking, 48% for reading, and 12% for writing. 45% of the population speak Frisian with their partner, 48% speak Frisian with their children [Taalatlas 2011]. Between 1980 and 2014, the percentage of parents speaking Frisian with their children decreased from 58% to 48%. The ability to speak Frisian well or very well fell from 85% to 64% between 1967 and 2014 [Taalatlas 2011]. Personal communication on West Frisian Off 350,000 100000