Question: when did maple leafs last win stanley cup
[{'answer': '1967', 'provenance': [{'wikipedia_id': '12340029', 'title': '1967 Stanley Cup Finals', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 4, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '12340029', 'title': '1967 Stanley Cup Finals', 'start_paragraph_id': 1, 'start_character': 89, 'end_paragraph_id': 1, 'end_character': 699, 'bleu_score': 0.526798408444008, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12715102056164936784}, 'section': 'Section::::Abstract.'}]}]