Question: when was the last year the raiders won the superbowl
[{'answer': '1983', 'provenance': [{'wikipedia_id': '22312', 'title': 'Oakland Raiders', 'start_paragraph_id': 2, 'start_character': 734, 'end_paragraph_id': 2, 'end_character': 738, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '22312', 'title': 'Oakland Raiders', 'section': 'Section::::Abstract.', 'start_paragraph_id': 2, 'end_paragraph_id': 2, 'meta': {'evidence_span': ["The team would go on to win its first (and only) AFL Championship that year; in doing so, the Raiders advanced to Super Bowl II, where they were soundly defeated by the Green Bay Packers. Since 1963, the team has won 15 division titles (3 AFL and 12 NFL), 4 AFC Championships (1976, 1980, 1983, and 2002), 1 AFL Championship (1967), and 3 Super Bowl Championships (XI, XV, and XVIII). At the end of the NFL's 2018 season, the Raiders boasted a lifetime regular season record of 466 wins, 423 losses, and 11 ties; their lifetime playoff record currently stands at 25 wins and 19 losses", 'the Raiders advanced to Super Bowl II, where they were soundly defeated by the Green Bay Packers. Since 1963, the team has won 15 division titles (3 AFL and 12 NFL), 4 AFC Championships (1976, 1980, 1983,', '1983']}}]}]