Question: when was the biltmore opened to the public
[{'answer': '1963', 'provenance': [{'wikipedia_id': '801578', 'title': 'Biltmore Estate', 'start_paragraph_id': 10, 'start_character': 58, 'end_paragraph_id': 10, 'end_character': 62, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '801578', 'title': 'Biltmore Estate', 'start_paragraph_id': 10, 'start_character': 0, 'end_paragraph_id': 10, 'end_character': 165, 'bleu_score': 0.7965020533851941, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15616812557197496745}, 'section': 'Section::::History.\n'}]}]