Question: when did the $50 note come out in australia
[{'answer': '1973', 'provenance': [{'wikipedia_id': '5268920', 'title': 'Australian fifty-dollar note', 'start_paragraph_id': 2, 'start_character': 16, 'end_paragraph_id': 2, 'end_character': 20, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '5268920', 'title': 'Australian fifty-dollar note', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 169, 'bleu_score': 0.929712191543383, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3396082504045665836}, 'section': 'Section::::1966–1973.\n'}]}]