Question: when did the first planet of the apes come out
[{'answer': '1968', 'provenance': [{'wikipedia_id': '24404702', 'title': 'Planet of the Apes', 'start_paragraph_id': 1, 'start_character': 371, 'end_paragraph_id': 1, 'end_character': 375, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]