Question: when did the brisbane broncos enter the nrl
[{'answer': '1988', 'provenance': [{'wikipedia_id': '5025', 'title': 'Brisbane Broncos', 'start_paragraph_id': 1, 'start_character': 274, 'end_paragraph_id': 1, 'end_character': 278, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '5025', 'title': 'Brisbane Broncos', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 543, 'bleu_score': 0.9088867144200361, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15375167035868132468}, 'section': 'Section::::History.\n'}]}]