Question: when was the last time the la galaxy won the mls cup
[{'answer': '2014', 'provenance': [{'wikipedia_id': '483246', 'title': 'MLS Cup', 'start_paragraph_id': 2, 'start_character': 311, 'end_paragraph_id': 2, 'end_character': 315, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]