Question: when was the last time the 76ers won the championship
[{'answer': '1983', 'provenance': [{'wikipedia_id': '72857', 'title': 'Philadelphia 76ers', 'start_paragraph_id': 2, 'start_character': 451, 'end_paragraph_id': 2, 'end_character': 455, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '72857', 'title': 'Philadelphia 76ers', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 636, 'bleu_score': 0.868873205546393, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6388493320667031064}, 'section': 'Section::::Abstract.'}]}]