Question: when was the guns and roses riot in st louis
[{'answer': 'July 2 , 1991', 'provenance': [{'wikipedia_id': '15113986', 'title': 'Riverport Riot', 'start_paragraph_id': 1, 'start_character': 33, 'end_paragraph_id': 1, 'end_character': 46, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '15113986', 'title': 'Riverport Riot', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 267, 'bleu_score': 0.7994150625595271, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1625708409218750570}, 'section': 'Section::::Abstract.'}]}]