Question: when was ed sheeran's song perfect released
[{'answer': '26 September 2017', 'provenance': [{'wikipedia_id': '52836376', 'title': 'Perfect (Ed Sheeran song)', 'start_paragraph_id': 1, 'start_character': 315, 'end_paragraph_id': 1, 'end_character': 332, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '52836376', 'title': 'Perfect (Ed Sheeran song)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 690, 'bleu_score': 0.737409192191657, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6028288699615608281}, 'section': 'Section::::Abstract.'}]}]