Question: when did collingwood last won a grand final
[{'answer': '2010', 'provenance': [{'wikipedia_id': '90407', 'title': 'Collingwood Football Club', 'start_paragraph_id': 23, 'start_character': 3, 'end_paragraph_id': 23, 'end_character': 7, 'bleu_score': 1.0, 'section': 'Section::::History.:1990–present.\n'}]}]