Question: when did the self balancing scooter come out
[{'answer': '2014', 'provenance': [{'wikipedia_id': '47740843', 'title': 'Self-balancing scooter', 'start_paragraph_id': 2, 'start_character': 137, 'end_paragraph_id': 2, 'end_character': 141, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '47740843', 'title': 'Self-balancing scooter', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 333, 'bleu_score': 0.8555108341109701, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17427782084344108349}, 'section': 'Section::::Abstract.'}]}]