Question: when's the last time the panthers went to the superbowl
[{'answer': '2015', 'provenance': [{'wikipedia_id': '6610', 'title': 'Carolina Panthers', 'start_paragraph_id': 2, 'start_character': 914, 'end_paragraph_id': 2, 'end_character': 918, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '6610', 'title': 'Carolina Panthers', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 1146, 'bleu_score': 0.922870029834235, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10459260871649278078}, 'section': 'Section::::Abstract.'}]}]