Question: when was the green bay packers stadium built
[{'answer': '1957', 'provenance': [{'wikipedia_id': '50461608', 'title': 'List of Green Bay Packers stadiums', 'start_paragraph_id': 2, 'start_character': 372, 'end_paragraph_id': 2, 'end_character': 376, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '50461608', 'title': 'List of Green Bay Packers stadiums', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 1425, 'bleu_score': 0.807306800384721, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13127776809520319788}, 'section': 'Section::::Abstract.'}]}]