Question: when did clemson win the national football championship
[{'answer': '1981', 'provenance': [{'wikipedia_id': '8755141', 'title': 'Clemson Tigers football', 'start_paragraph_id': 52, 'start_character': 765, 'end_paragraph_id': 52, 'end_character': 769, 'bleu_score': 1.0, 'section': 'Section::::History.:Danny Ford era (1978–1989).\n'}]}, {'answer': '2016', 'provenance': [{'wikipedia_id': '8755141', 'title': 'Clemson Tigers football', 'start_paragraph_id': 2, 'start_character': 216, 'end_paragraph_id': 2, 'end_character': 220, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]