Question: when did the st louis blues enter the nhl
[{'answer': '1967', 'provenance': [{'wikipedia_id': '30519527', 'title': 'St. Louis Blues', 'start_paragraph_id': 1, 'start_character': 218, 'end_paragraph_id': 1, 'end_character': 222, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]