Question: when was the ar 15 first sold to us civilians
[{'answer': '1959', 'provenance': [{'wikipedia_id': '904916', 'title': 'ArmaLite AR-15', 'start_paragraph_id': 1, 'start_character': 132, 'end_paragraph_id': 1, 'end_character': 136, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '904916', 'title': 'ArmaLite AR-15', 'start_paragraph_id': 1, 'start_character': 22, 'end_paragraph_id': 1, 'end_character': 481, 'bleu_score': 0.7336939921251601, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9843556174388197168}, 'section': 'Section::::Abstract.'}]}]