Question: when was the last time ghana won african cup of nations
[{'answer': '1982', 'provenance': [{'wikipedia_id': '250680', 'title': 'Africa Cup of Nations', 'start_paragraph_id': 13, 'start_character': 120, 'end_paragraph_id': 13, 'end_character': 124, 'bleu_score': 1.0, 'section': 'Section::::History.:1960s: Ghanaian domination.\n'}]}]