Question: when did tampa bay lightning join the nhl
[{'answer': '1992', 'provenance': [{'wikipedia_id': '73124', 'title': 'Tampa Bay Lightning', 'start_paragraph_id': 4, 'start_character': 24, 'end_paragraph_id': 4, 'end_character': 28, 'bleu_score': 1.0, 'section': 'Section::::Franchise history.\n'}]}]