Question: when was the last time georgia tech won a national championship
[{'answer': '1990', 'provenance': [{'wikipedia_id': '7957577', 'title': 'Georgia Tech Yellow Jackets football', 'start_paragraph_id': 2, 'start_character': 179, 'end_paragraph_id': 2, 'end_character': 183, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]