Question: when did seat belts become mandatory in nsw
[{'answer': '1971', 'provenance': [{'wikipedia_id': '925848', 'title': 'Seat belt legislation', 'start_paragraph_id': 4, 'start_character': 216, 'end_paragraph_id': 4, 'end_character': 220, 'bleu_score': 1.0, 'section': 'Section::::National comparisons.:Australia.\n'}]}]