Question: when were manatees put on the endangered list
[{'answer': '1966', 'provenance': [{'wikipedia_id': '20387006', 'title': 'Manatee conservation', 'start_paragraph_id': 5, 'start_character': 412, 'end_paragraph_id': 5, 'end_character': 416, 'bleu_score': 1.0, 'section': 'Section::::Becoming endangered / legal protection.\n'}]}, {'provenance': [{'wikipedia_id': '20387006', 'title': 'Manatee conservation', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 806, 'bleu_score': 0.9397719915984201, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11660578582131905121}, 'section': 'Section::::Becoming endangered / legal protection.\n'}]}]