Question: when was the last time west coast eagles won the grand final
[{'answer': '2006', 'provenance': [{'wikipedia_id': '295230', 'title': 'West Coast Eagles', 'start_paragraph_id': 2, 'start_character': 450, 'end_paragraph_id': 2, 'end_character': 454, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '295230', 'title': 'West Coast Eagles', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 939, 'bleu_score': 0.916747559721597, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13208923888190482441}, 'section': 'Section::::Abstract.'}]}]