Question: when's the last time notre dame won a national championship
[{'answer': '1988', 'provenance': [{'wikipedia_id': '1245667', 'title': 'Notre Dame Fighting Irish football', 'start_paragraph_id': 54, 'start_character': 491, 'end_paragraph_id': 54, 'end_character': 495, 'bleu_score': 1.0, 'section': 'Section::::History.:Lou Holtz era (1986–1996).\n'}]}, {'provenance': [{'wikipedia_id': '1245667', 'title': 'Notre Dame Fighting Irish football', 'start_paragraph_id': 98, 'start_character': 0, 'end_paragraph_id': 98, 'end_character': 228, 'bleu_score': 0.9466178497997021, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 714146312974672809}, 'section': 'Section::::Championships and Distinctions.:National Championships.\n'}]}]