Question: when is the last time the warriors won a championship
[{'answer': '2017', 'provenance': [{'wikipedia_id': '72891', 'title': 'Golden State Warriors', 'start_paragraph_id': 3, 'start_character': 562, 'end_paragraph_id': 3, 'end_character': 566, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]