Question: when was the cleveland browns last winning season
[{'answer': '1964', 'provenance': [{'wikipedia_id': '10630606', 'title': 'List of Cleveland Browns seasons', 'start_paragraph_id': 1, 'start_character': 599, 'end_paragraph_id': 1, 'end_character': 603, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '10630606', 'title': 'List of Cleveland Browns seasons', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 742, 'bleu_score': 0.947265548358389, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13151239823598194675}, 'section': 'Section::::Abstract.'}]}]