Question: 1 decade is equal to how many years
[{'answer': 'ten years', 'provenance': [{'wikipedia_id': '695530', 'title': 'Decade', 'start_paragraph_id': 3, 'start_character': 26, 'end_paragraph_id': 3, 'end_character': 35, 'bleu_score': 1.0, 'section': 'Section::::Usage.\n'}]}, {'provenance': [{'wikipedia_id': '695530', 'title': 'Decade', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 297, 'bleu_score': 0.792942647668316, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3755344688553689529}, 'section': 'Section::::Abstract.'}]}]