Question: when did standing for the national anthem begin
[{'answer': 'June 22 , 1942', 'provenance': [{'wikipedia_id': '31064', 'title': 'The Star-Spangled Banner', 'start_paragraph_id': 48, 'start_character': 131, 'end_paragraph_id': 48, 'end_character': 145, 'bleu_score': 1.0, 'section': 'Section::::Customs and federal law.\n'}]}, {'provenance': [{'wikipedia_id': '31064', 'title': 'The Star-Spangled Banner', 'start_paragraph_id': 48, 'start_character': 0, 'end_paragraph_id': 48, 'end_character': 1785, 'bleu_score': 0.9821515030980881, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15320666942552268584}, 'section': 'Section::::Customs and federal law.\n'}]}]