Question: when did the crows win the afl grand final
[{'answer': '1997', 'provenance': [{'wikipedia_id': '100978', 'title': 'Adelaide Football Club', 'start_paragraph_id': 2, 'start_character': 270, 'end_paragraph_id': 2, 'end_character': 274, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': '1998', 'provenance': [{'wikipedia_id': '100978', 'title': 'Adelaide Football Club', 'start_paragraph_id': 2, 'start_character': 279, 'end_paragraph_id': 2, 'end_character': 283, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]