Question: who won the superbowl the last 3 years
[{'answer': 'New England Patriots', 'provenance': [{'wikipedia_id': '2145410', 'title': 'List of Super Bowl champions', 'start_paragraph_id': 3, 'start_character': 4, 'end_paragraph_id': 3, 'end_character': 24, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Denver Broncos', 'provenance': [{'wikipedia_id': '2145410', 'title': 'List of Super Bowl champions', 'start_paragraph_id': 3, 'start_character': 493, 'end_paragraph_id': 3, 'end_character': 507, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]