Question: when was the last time roe v wade was challenged
[{'answer': '2016', 'provenance': [{'wikipedia_id': '68493', 'title': 'Roe v. Wade', 'start_paragraph_id': 87, 'start_character': 214, 'end_paragraph_id': 87, 'end_character': 218, 'bleu_score': 1.0, 'section': 'Section::::Role in subsequent decisions and politics.:"Whole Woman\'s Health v. Hellerstedt".\n'}]}, {'provenance': [{'wikipedia_id': '68493', 'title': 'Roe v. Wade', 'start_paragraph_id': 87, 'start_character': 0, 'end_paragraph_id': 87, 'end_character': 991, 'bleu_score': 0.9666950091602231, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18271876888222208506}, 'section': 'Section::::Role in subsequent decisions and politics.:"Whole Woman\'s Health v. Hellerstedt".\n'}]}]