Question: when did this annual message officially become known as sotu address
[{'answer': '1947', 'provenance': [{'wikipedia_id': '37081', 'title': 'State of the Union', 'start_paragraph_id': 11, 'start_character': 238, 'end_paragraph_id': 11, 'end_character': 242, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '37081', 'title': 'State of the Union', 'start_paragraph_id': 11, 'start_character': 0, 'end_paragraph_id': 11, 'end_character': 242, 'bleu_score': 0.9517713210466091, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10868342274844211310}, 'section': 'Section::::History.\n'}]}]