Question: when did advance australia fair become the national anthem
[{'answer': '1984', 'provenance': [{'wikipedia_id': '2053', 'title': 'Advance Australia Fair', 'start_paragraph_id': 1, 'start_character': 271, 'end_paragraph_id': 1, 'end_character': 275, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2053', 'title': 'Advance Australia Fair', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 451, 'bleu_score': 0.9488772845414021, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13648654898152467032}, 'section': 'Section::::Abstract.'}]}]