Question: when did uzbekistan gain independence from the soviet union
[{'answer': '31 August 1991', 'provenance': [{'wikipedia_id': '31853', 'title': 'Uzbekistan', 'start_paragraph_id': 2, 'start_character': 1892, 'end_paragraph_id': 2, 'end_character': 1906, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '31853', 'title': 'Uzbekistan', 'start_paragraph_id': 33, 'start_character': 0, 'end_paragraph_id': 33, 'end_character': 269, 'bleu_score': 0.9529077664391161, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15642767494372222602}, 'section': 'Section::::History.\n'}]}]