Question: when did ghana won the under 20 world cup
[{'answer': '2009', 'provenance': [{'wikipedia_id': '13838238', 'title': 'Ghana national under-20 football team', 'start_paragraph_id': 1, 'start_character': 285, 'end_paragraph_id': 1, 'end_character': 289, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '13838238', 'title': 'Ghana national under-20 football team', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 246, 'bleu_score': 0.955027111100031, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10987079362144082988}, 'section': 'Section::::Abstract.'}]}]