Question: what years did the harry potter books take place
[{'answer': '1991 to 1998', 'provenance': [{'wikipedia_id': '2387806', 'title': 'Harry Potter', 'start_paragraph_id': 9, 'start_character': 70, 'end_paragraph_id': 9, 'end_character': 82, 'bleu_score': 1.0, 'section': 'Section::::Plot.\n'}]}, {'provenance': [{'wikipedia_id': '2387806', 'title': 'Harry Potter', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 236, 'bleu_score': 0.950578622812921, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5474293762639251939}, 'section': 'Section::::Plot.\n'}]}]