Question: when did st louis bread company become panera
[{'answer': '1997', 'provenance': [{'wikipedia_id': '915309', 'title': 'Panera Bread', 'start_paragraph_id': 4, 'start_character': 52, 'end_paragraph_id': 4, 'end_character': 56, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]