Question: when was advance australia fair proclaimed as the national anthem
[{'answer': '19 April 1984', 'provenance': [{'wikipedia_id': '2053', 'title': 'Advance Australia Fair', 'start_paragraph_id': 12, 'start_character': 143, 'end_paragraph_id': 12, 'end_character': 156, 'bleu_score': 1.0, 'section': 'Section::::History.:Competitions, plebiscite and adoption.\n'}]}, {'provenance': [{'wikipedia_id': '2053', 'title': 'Advance Australia Fair', 'start_paragraph_id': 12, 'start_character': 0, 'end_paragraph_id': 12, 'end_character': 491, 'bleu_score': 0.9751504244977051, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2311416718912335382}, 'section': 'Section::::History.:Competitions, plebiscite and adoption.\n'}]}]