Question: when did the pittsburgh penguins come into the nhl
[{'answer': '1967', 'provenance': [{'wikipedia_id': '66964', 'title': 'Pittsburgh Penguins', 'start_paragraph_id': 2, 'start_character': 29, 'end_paragraph_id': 2, 'end_character': 33, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '66964', 'title': 'Pittsburgh Penguins', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 1032, 'bleu_score': 0.8776921248683771, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15862455626016569003}, 'section': 'Section::::Abstract.'}]}]