Question: when was the last time clemson won the national championship
[{'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.'}]}, {'provenance': [{'wikipedia_id': '8755141', 'title': 'Clemson Tigers football', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 774, 'bleu_score': 0.8034666416195391, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1515822435464609517}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '8755141', 'title': 'Clemson Tigers football', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1515822435464609517}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '8755141', 'title': 'Clemson Tigers football', 'section': 'Section::::Abstract.', 'start_paragraph_id': 2, 'end_paragraph_id': 2, 'meta': {'evidence_span': ['Formed in 1896, the program has over 700 wins and has achieved three consensus Division I Football National Championships in the modern era, and were College Football Playoff National Championship Finalists in 2015, 2016, and 2018, winning the championship game over the Alabama Crimson Tide for the 2016 and 2018 seasons.', '2016']}}]}, {'provenance': [{'wikipedia_id': '14503740', 'title': "Clemson Tigers men's basketball", 'section': 'Section::::Atlantic Coast Conference.:Brad Brownell.\n', 'start_paragraph_id': 21, 'end_paragraph_id': 21, 'meta': {'evidence_span': ['The Tigers were seeded 6th in the 2014 ACC Tournament and advanced to the semifinals of the NIT at Madison Square Garden. On January 16, 2016 the Clemson Tigers defeated #8 Miami marking the first time Clemson has defeated three consecutive top 25 opponents', '2016']}}]}]