Question: when did the raiders move back to oakland
[{'answer': '1995', 'provenance': [{'wikipedia_id': '22312', 'title': 'Oakland Raiders', 'start_paragraph_id': 3, 'start_character': 140, 'end_paragraph_id': 3, 'end_character': 144, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]