Question: when did london win the 2012 olympic bid
[{'answer': '6 July 2005', 'provenance': [{'wikipedia_id': '1508346', 'title': 'London bid for the 2012 Summer Olympics', 'start_paragraph_id': 2, 'start_character': 389, 'end_paragraph_id': 2, 'end_character': 400, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1508346', 'title': 'London bid for the 2012 Summer Olympics', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 637, 'bleu_score': 0.9825310706027971, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13711356242247743879}, 'section': 'Section::::Abstract.'}]}]