Question: when did the mazda 6 body style change
[{'answer': '2009 model year', 'provenance': [{'wikipedia_id': '1052359', 'title': 'Mazda6', 'start_paragraph_id': 30, 'start_character': 50, 'end_paragraph_id': 30, 'end_character': 65, 'bleu_score': 1.0, 'section': 'Section::::Second generation (GH1; 2007–2012).:North America.\n'}]}, {'provenance': [{'wikipedia_id': '1052359', 'title': 'Mazda6', 'start_paragraph_id': 30, 'start_character': 0, 'end_paragraph_id': 30, 'end_character': 507, 'bleu_score': 0.7964945780635021, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14158906988413246518}, 'section': 'Section::::Second generation (GH1; 2007–2012).:North America.\n'}]}]