Question: when was the martial law declared in mindanao
[{'answer': 'May 23 , 2017', 'provenance': [{'wikipedia_id': '54141954', 'title': 'Proclamation No. 216', 'start_paragraph_id': 4, 'start_character': 24, 'end_paragraph_id': 4, 'end_character': 37, 'bleu_score': 1.0, 'section': 'Section::::History.:Declaration.\n'}]}, {'provenance': [{'wikipedia_id': '54141954', 'title': 'Proclamation No. 216', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 210, 'bleu_score': 0.9451524926983921, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3567880459895011212}, 'section': 'Section::::Abstract.'}]}]