Question: when did the golden knights join the nhl
[{'answer': '2017', 'provenance': [{'wikipedia_id': '47712000', 'title': 'Vegas Golden Knights', 'start_paragraph_id': 1, 'start_character': 251, 'end_paragraph_id': 1, 'end_character': 255, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '47712000', 'title': 'Vegas Golden Knights', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 473, 'bleu_score': 0.7613621702590461, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14417274804776645301}, 'section': 'Section::::Abstract.'}]}]