Question: when was the last time a team won back to back superbowls
[{'answer': '2003 -- 2004'}, {'provenance': [{'wikipedia_id': '2145410', 'title': 'List of Super Bowl champions', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 1830, 'bleu_score': 0.73273846046181, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13544935635731140577}, 'section': 'Section::::Abstract.'}]}]