Question: when did the maple leafs last win a stanley cup
[{'answer': '1967', 'provenance': [{'wikipedia_id': '70155', 'title': 'Toronto Maple Leafs', 'start_paragraph_id': 2, 'start_character': 611, 'end_paragraph_id': 2, 'end_character': 615, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '70155', 'title': 'Toronto Maple Leafs', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 910, 'bleu_score': 0.936002963337433, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10826789534385010991}, 'section': 'Section::::Abstract.'}]}]