Question: when did the first vampire diaries book come out
[{'answer': '1991', 'provenance': [{'wikipedia_id': '3598678', 'title': 'The Vampire Diaries (novel series)', 'start_paragraph_id': 3, 'start_character': 39, 'end_paragraph_id': 3, 'end_character': 43, 'bleu_score': 1.0, 'section': 'Section::::Publishing history.\n'}]}, {'provenance': [{'wikipedia_id': '3598678', 'title': 'The Vampire Diaries (novel series)', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 389, 'bleu_score': 0.968982777549629, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5954695140013816723}, 'section': 'Section::::Publishing history.\n'}]}]