Question: when was canada's food guide last updated
[{'answer': '2007', 'provenance': [{'wikipedia_id': '3875589', 'title': "Canada's Food Guide", 'start_paragraph_id': 1, 'start_character': 71, 'end_paragraph_id': 1, 'end_character': 75, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]