Question: when did the vancouver grizzlies join the nba
[{'answer': 'in 1995', 'provenance': [{'wikipedia_id': '430318', 'title': 'Vancouver Grizzlies', 'start_paragraph_id': 1, 'start_character': 243, 'end_paragraph_id': 1, 'end_character': 250, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '430318', 'title': 'Vancouver Grizzlies', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 578, 'bleu_score': 0.8715934312512771, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9910028715064645961}, 'section': 'Section::::Abstract.'}]}]