Question: when did west indies won t20 world cup
[{'answer': '2016', 'provenance': [{'wikipedia_id': '8258172', 'title': 'ICC T20 World Cup', 'start_paragraph_id': 2, 'start_character': 183, 'end_paragraph_id': 2, 'end_character': 187, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]