Question: when did how to train a dragon come out
[{'answer': '2010', 'provenance': [{'wikipedia_id': '18394730', 'title': 'How to Train Your Dragon (film)', 'start_paragraph_id': 1, 'start_character': 30, 'end_paragraph_id': 1, 'end_character': 34, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '18394730', 'title': 'How to Train Your Dragon (film)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 508, 'bleu_score': 0.5850139983890791, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3354446807112961969}, 'section': 'Section::::Abstract.'}]}]