Data on specific Aboriginal and Torres Strait Islander languages are only available for the 1996 and subsequent Censuses.
The Australian Standard Classification of Languages (ASCL) was revised in 2005 with extensive changes to the major group Australian Indigenous Languages.
The Census asks a question on language other than English spoken at home. The question may not collect complete language use data, but does give an indication of the number of speakers of Indigenous languages in Australia.
See also Language Spoken at Home (LANP).