Question: when was the st louis cardinals stadium built
[{'answer': 'April 4 , 2006', 'provenance': [{'wikipedia_id': '2070074', 'title': 'Busch Stadium', 'start_paragraph_id': 2, 'start_character': 22, 'end_paragraph_id': 2, 'end_character': 40, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]