Question: when did cristiano ronaldo stop playing for manchester united
[{'answer': '2009', 'provenance': [{'wikipedia_id': '623737', 'title': 'Cristiano Ronaldo', 'start_paragraph_id': 2, 'start_character': 650, 'end_paragraph_id': 2, 'end_character': 654, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]