Question: when was the last time the statue of liberty was cleaned
[{'answer': '1986', 'provenance': [{'wikipedia_id': '31016272', 'title': 'Conservation-restoration of the Statue of Liberty', 'start_paragraph_id': 1, 'start_character': 124, 'end_paragraph_id': 1, 'end_character': 128, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '31016272', 'title': 'Conservation-restoration of the Statue of Liberty', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 642, 'bleu_score': 0.6277991010392711, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11487666845987330136}, 'section': 'Section::::Abstract.'}]}]