Question: when did the spurs win their first championship
[{'answer': '1999', 'provenance': [{'wikipedia_id': '72889', 'title': 'San Antonio Spurs', 'start_paragraph_id': 2, 'start_character': 244, 'end_paragraph_id': 2, 'end_character': 248, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]