Question: who did william byron drive for last year
[{'answer': 'JR Motorsports', 'provenance': [{'wikipedia_id': '47122388', 'title': 'William Byron (racing driver)', 'start_paragraph_id': 5, 'start_character': 28, 'end_paragraph_id': 5, 'end_character': 42, 'bleu_score': 1.0, 'section': 'Section::::Racing career.\n'}]}, {'provenance': [{'wikipedia_id': '47122388', 'title': 'William Byron (racing driver)', 'start_paragraph_id': 12, 'start_character': 0, 'end_paragraph_id': 12, 'end_character': 1029, 'bleu_score': 0.951276038953455, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11927697631019666762}, 'section': 'Section::::Racing career.:Xfinity Series.\n'}]}]