Question: When did they change the australian national anthem?
Disambiguated questions and answers: question: When did they officially change the australian national anthem to a modified version of "Advance Australia Fair"?
When did they reinstate "God Save the Queen" as the australian national anthem for ceremonial occasions?
When did they first conduct a national survey regarding changing the australian national anthem to "Advance Australia Fair"?
When did they conduct a formal vote regarding changing the australian national anthem to "Advance Australia Fair"?
answer: 19 April 1984
January 1976
1974
21 May 1977
Natural Questions answer: 1984 (from the Wikipedia article "Advance Australia Fair")