Question: when did the first harry potter book cone out
[{'answer': 'in 1997', 'provenance': [{'wikipedia_id': '48648', 'title': "Harry Potter and the Philosopher's Stone", 'start_paragraph_id': 41, 'start_character': 0, 'end_paragraph_id': 41, 'end_character': 7, 'bleu_score': 1.0, 'section': 'Section::::Development, publication and reception.:Publication and reception in the United Kingdom.\n'}]}, {'provenance': [{'wikipedia_id': '48648', 'title': "Harry Potter and the Philosopher's Stone", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 628, 'bleu_score': 0.641890959261602, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12546714087142601546}, 'section': 'Section::::Abstract.'}]}]