Question: when is the last time the toronto argonauts won the grey cup
[{'answer': '2017', 'provenance': [{'wikipedia_id': '254163', 'title': 'Toronto Argonauts', 'start_paragraph_id': 2, 'start_character': 177, 'end_paragraph_id': 2, 'end_character': 181, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]