Question: when did seat belts become law in australia
[{'answer': '1973', 'provenance': [{'wikipedia_id': '925848', 'title': 'Seat belt legislation', 'start_paragraph_id': 4, 'start_character': 239, 'end_paragraph_id': 4, 'end_character': 243, 'bleu_score': 1.0, 'section': 'Section::::National comparisons.:Australia.\n'}]}, {'provenance': [{'wikipedia_id': '925848', 'title': 'Seat belt legislation', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 708, 'bleu_score': 0.9826823455989031, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9927262178990303309}, 'section': 'Section::::National comparisons.:Australia.\n'}]}]