Question: when did the chevy malibu change body styles
[{'answer': '1997', 'provenance': [{'wikipedia_id': '1039628', 'title': 'Chevrolet Malibu', 'start_paragraph_id': 1, 'start_character': 106, 'end_paragraph_id': 1, 'end_character': 110, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1039628', 'title': 'Chevrolet Malibu', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 319, 'bleu_score': 0.9196822664155291, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16865056315906247288}, 'section': 'Section::::Abstract.'}]}]