Question: when was the last olympics held in beijing china
[{'answer': '2008', 'provenance': [{'wikipedia_id': '77745', 'title': '2008 Summer Olympics', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 4, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '77745', 'title': '2008 Summer Olympics', 'start_paragraph_id': 85, 'start_character': 0, 'end_paragraph_id': 85, 'end_character': 151, 'bleu_score': 0.929712191543383, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18275296996261830948}, 'section': 'Section::::Legacy.\n'}]}]