Question: when did the mafia lose control of las vegas
[{'answer': 'the 1980s', 'provenance': [{'wikipedia_id': '2087269', 'title': 'History of Las Vegas', 'start_paragraph_id': 63, 'start_character': 80, 'end_paragraph_id': 63, 'end_character': 89, 'bleu_score': 1.0, 'section': 'Section::::Since 1989: the megaresort era.\n'}]}, {'provenance': [{'wikipedia_id': '2087269', 'title': 'History of Las Vegas', 'start_paragraph_id': 63, 'start_character': 0, 'end_paragraph_id': 63, 'end_character': 979, 'bleu_score': 0.9733831041780681, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 245833805353249646}, 'section': 'Section::::Since 1989: the megaresort era.\n'}]}]