Question: when did they start putting back up cameras in cars
[{'answer': '2000', 'provenance': [{'wikipedia_id': '5977757', 'title': 'Backup camera', 'start_paragraph_id': 18, 'start_character': 327, 'end_paragraph_id': 18, 'end_character': 331, 'bleu_score': 1.0, 'section': 'Section::::Introduction.\n'}]}, {'provenance': [{'wikipedia_id': '5977757', 'title': 'Backup camera', 'start_paragraph_id': 18, 'start_character': 0, 'end_paragraph_id': 18, 'end_character': 910, 'bleu_score': 0.945885067515242, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 627505516445125559}, 'section': 'Section::::Introduction.\n'}]}]