Question: when did dragon ball z end in america
[{'answer': '1998', 'provenance': [{'wikipedia_id': '40006090', 'title': 'Dragon Ball Z', 'start_paragraph_id': 14, 'start_character': 869, 'end_paragraph_id': 14, 'end_character': 873, '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': 0.989873091526375, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6484279649734477015}, 'section': 'Section::::Production and broadcasting.:English dub production and broadcasting.\n'}]}]