Question: when did nfl start standing for the anthem
[{'answer': '2009', 'provenance': [{'wikipedia_id': '51676196', 'title': 'U.S. national anthem protests (2016–present)', 'start_paragraph_id': 4, 'start_character': 439, 'end_paragraph_id': 4, 'end_character': 443, 'bleu_score': 1.0, 'section': 'Section::::Background.\n'}]}, {'provenance': [{'wikipedia_id': '51676196', 'title': 'U.S. national anthem protests (2016–present)', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 642, 'bleu_score': 0.7166059748916, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5691308595174565335}, 'section': 'Section::::Background.\n'}]}]