Question: when did the spurs win their last championship
[{'answer': '2014', 'provenance': [{'wikipedia_id': '72889', 'title': 'San Antonio Spurs', 'start_paragraph_id': 2, 'start_character': 272, 'end_paragraph_id': 2, 'end_character': 276, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]