Question: when did covent garden market move to nine elms
[{'answer': '11 November 1974', 'provenance': [{'wikipedia_id': '990646', 'title': 'New Covent Garden Market', 'start_paragraph_id': 6, 'start_character': 106, 'end_paragraph_id': 6, 'end_character': 122, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '990646', 'title': 'New Covent Garden Market', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 122, 'bleu_score': 0.910879922930628, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8226029548407102671}, 'section': 'Section::::History.\n'}]}]