Question: when was the last time wales won the rugby world cup sevens
[{'answer': '2009', 'provenance': [{'wikipedia_id': '4431781', 'title': 'Wales national rugby sevens team', 'start_paragraph_id': 2, 'start_character': 60, 'end_paragraph_id': 2, 'end_character': 64, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4431781', 'title': 'Wales national rugby sevens team', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 230, 'bleu_score': 0.950578622812921, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13847605794576029192}, 'section': 'Section::::Abstract.'}]}]