Question: when did the book battle royale come out
[{'answer': '1999', 'provenance': [{'wikipedia_id': '221714', 'title': 'Battle Royale (novel)', 'start_paragraph_id': 1, 'start_character': 220, 'end_paragraph_id': 1, 'end_character': 224, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]