Question: when was the last time arkansas won the cws
[{'answer': '2018', 'provenance': [{'wikipedia_id': '17473808', 'title': 'Arkansas Razorbacks baseball', 'start_paragraph_id': 2, 'start_character': 128, 'end_paragraph_id': 2, 'end_character': 132, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '17473808', 'title': 'Arkansas Razorbacks baseball', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 132, 'bleu_score': 0.688043084975643, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13772674532660070158}, 'section': 'Section::::Abstract.'}]}]