Question: the juvenile court system in the u.s. has been in existence since
[{'answer': '1899', 'provenance': [{'wikipedia_id': '4446186', 'title': 'American juvenile justice system', 'start_paragraph_id': 8, 'start_character': 60, 'end_paragraph_id': 8, 'end_character': 64, 'bleu_score': 1.0, 'section': 'Section::::History and background.:Early 1900s.\n'}]}, {'provenance': [{'wikipedia_id': '4446186', 'title': 'American juvenile justice system', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 1040, 'bleu_score': 0.972571845223218, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3935368170520765356}, 'section': 'Section::::History and background.:Early 1900s.\n'}]}]