Question: when was dragon ball z first aired in the us
[{'answer': 'September 13 , 1996', 'provenance': [{'wikipedia_id': '40006090', 'title': 'Dragon Ball Z', 'start_paragraph_id': 14, 'start_character': 799, 'end_paragraph_id': 14, 'end_character': 820, 'bleu_score': 1.0, 'section': 'Section::::Production and broadcasting.:English dub production and broadcasting.\n'}]}, {'provenance': [{'wikipedia_id': '40006090', 'title': 'Dragon Ball Z', 'start_paragraph_id': 14, 'start_character': 0, 'end_paragraph_id': 14, 'end_character': 1200, 'bleu_score': 0.9718155905451871, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1716672968402515056}, 'section': 'Section::::Production and broadcasting.:English dub production and broadcasting.\n'}]}]