Question: when did the radio flyer wagon come out
[{'answer': '1917', 'provenance': [{'wikipedia_id': '618364', 'title': 'Radio Flyer', 'start_paragraph_id': 1, 'start_character': 189, 'end_paragraph_id': 1, 'end_character': 193, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '618364', 'title': 'Radio Flyer', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 227, 'bleu_score': 0.948006874591591, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17964904446099822876}, 'section': 'Section::::Abstract.'}]}]