Question: nota option was first used in the election in which year
[{'answer': '1991'}, {'provenance': [{'wikipedia_id': '699156', 'title': 'None of the above', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 510, 'bleu_score': 0.92126674272357, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11999009906118055860}, 'section': 'Section::::Soviet Union.\n'}]}]