Question: when did the first football player take a knee
[{'answer': 'September 1 , 2016', 'provenance': [{'wikipedia_id': '51676196', 'title': 'U.S. national anthem protests (2016–present)', 'start_paragraph_id': 20, 'start_character': 215, 'end_paragraph_id': 20, 'end_character': 233, 'bleu_score': 1.0, 'section': 'Section::::NFL protests.:2016 preseason.\n'}]}, {'provenance': [{'wikipedia_id': '51676196', 'title': 'U.S. national anthem protests (2016–present)', 'start_paragraph_id': 20, 'start_character': 0, 'end_paragraph_id': 20, 'end_character': 819, 'bleu_score': 0.974627269932217, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 774566091005374359}, 'section': 'Section::::NFL protests.:2016 preseason.\n'}]}]