According to study by Yrizar, this dialect was spoken in the seventies by around 200,000 people, with the number of estimated speakers approaching 300,000 by the eighties. In 1991 16% of the population of this province could speak Basque, and data gathered in 2001 data 22% of the total 1.122.710 Biscayans (i.e. 247,000) could speak and write in Basque. However, this data is only illustrative, as there is no record of how many of the Basque speakers spoke Biscayan specifically and it does not take into account Biscayan speakers in Gipuzkoan territory (Bergara, Leintz Gatzaga, Mondragon, Oñati, etc.)