Question: when was the last time ghana won afcon
[{'answer': '1982', 'provenance': [{'wikipedia_id': '1029620', 'title': 'Ghana national football team', 'start_paragraph_id': 2, 'start_character': 375, 'end_paragraph_id': 2, 'end_character': 379, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1029620', 'title': 'Ghana national football team', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 806, 'bleu_score': 0.9685451587663261, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9576269178997116793}, 'section': 'Section::::Abstract.'}]}]