Question: when did miami heat win their last championship
[{'answer': '2013', 'provenance': [{'wikipedia_id': '72850', 'title': 'Miami Heat', 'start_paragraph_id': 4, 'start_character': 380, 'end_paragraph_id': 4, 'end_character': 384, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]