Question: who won the premier league 3 years ago
[{'answer': 'Chelsea', 'provenance': [{'wikipedia_id': '13650903', 'title': 'List of Premier League seasons', 'start_paragraph_id': 3, 'start_character': 60, 'end_paragraph_id': 3, 'end_character': 67, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]