Question: when was capita fully listed on the london stock exchange
[{'answer': '1991', 'provenance': [{'wikipedia_id': '2018145', 'title': 'Capita', 'start_paragraph_id': 5, 'start_character': 287, 'end_paragraph_id': 5, 'end_character': 291, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '2018145', 'title': 'Capita', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 291, 'bleu_score': 0.881294886928336, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13629816989788336515}, 'section': 'Section::::History.\n'}]}]