Question: when was the roof put on centre court at wimbledon
[{'answer': '2009', 'provenance': [{'wikipedia_id': '2453505', 'title': 'Centre Court', 'start_paragraph_id': 2, 'start_character': 36, 'end_paragraph_id': 2, 'end_character': 40, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2453505', 'title': 'Centre Court', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 264, 'bleu_score': 0.959574895300321, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3852860318715231176}, 'section': 'Section::::Abstract.'}]}]