In 1990 it was estimated that 90 languages still survived of the approximately 250 once spoken, but with a high rate of attrition as elders died out. Of the 90, 70% by 2001 were judged as 'severely endangered' with only 17 spoken by all age groups, a definition of a 'strong' language. On these grounds it is anticipated that despite efforts at linguistic preservation, many of the remaining languages will disappear within the next generation. The overall trend suggests that in the not too distant future all of the Indigenous languages will be lost, perhaps by 2050, and with them the cultural knowledge they convey.