Question: when was the last time the lakers won the nba championship
[{'answer': '2010', 'provenance': [{'wikipedia_id': '72893', 'title': 'Los Angeles Lakers', 'start_paragraph_id': 4, 'start_character': 632, 'end_paragraph_id': 4, 'end_character': 636, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]