Question: what percentage of the everglades remains and is protected by the park
[{'answer': '20', 'provenance': [{'wikipedia_id': '185216', 'title': 'Everglades National Park', 'start_paragraph_id': 3, 'start_character': 178, 'end_paragraph_id': 3, 'end_character': 180, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]