Question: when did nissan change the maxima body style
[{'answer': 'April 2015', 'provenance': [{'wikipedia_id': '318159', 'title': 'Nissan Maxima', 'start_paragraph_id': 66, 'start_character': 31, 'end_paragraph_id': 66, 'end_character': 41, 'bleu_score': 1.0, 'section': 'Section::::North America.:Eighth generation (A36; 2015–present).\n'}]}, {'provenance': [{'wikipedia_id': '318159', 'title': 'Nissan Maxima', 'start_paragraph_id': 66, 'start_character': 0, 'end_paragraph_id': 66, 'end_character': 562, 'bleu_score': 0.820628949179885, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5524493429660056224}, 'section': 'Section::::North America.:Eighth generation (A36; 2015–present).\n'}]}]