Question: when did ford change the f150 body style
[{'answer': '1957', 'provenance': [{'wikipedia_id': '895409', 'title': 'Ford F-Series', 'start_paragraph_id': 10, 'start_character': 29, 'end_paragraph_id': 10, 'end_character': 33, 'bleu_score': 1.0, 'section': 'Section::::Second generation (1953–1956).\n'}]}, {'answer': 'the 2009 model year', 'provenance': [{'wikipedia_id': '895409', 'title': 'Ford F-Series', 'start_paragraph_id': 55, 'start_character': 48, 'end_paragraph_id': 55, 'end_character': 67, 'bleu_score': 1.0, 'section': 'Section::::Twelfth generation (2009–2014).\n'}]}, {'provenance': [{'wikipedia_id': '895409', 'title': 'Ford F-Series', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5540704334991607203}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '895409', 'title': 'Ford F-Series', 'start_paragraph_id': 11, 'start_character': 0, 'end_paragraph_id': 11, 'end_character': 221, 'bleu_score': 0.9451524926983921, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5540704334991607203}, 'section': 'Section::::Third generation (1957–1960).\n'}]}, {'provenance': [{'wikipedia_id': '895409', 'title': 'Ford F-Series', 'start_paragraph_id': 55, 'start_character': 0, 'end_paragraph_id': 55, 'end_character': 517, 'bleu_score': 0.899857788642431, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5540704334991607203}, 'section': 'Section::::Twelfth generation (2009–2014).\n'}]}, {'provenance': [{'wikipedia_id': '895409', 'title': 'Ford F-Series', 'section': 'Section::::Twelfth generation (2009–2014).\n', 'start_paragraph_id': 55, 'end_paragraph_id': 55, 'meta': {'evidence_span': ['The twelfth generation F-150 was introduced for the 2009 model year as an update of the Ford full-size truck platform. Similar to its predecessor, these trucks are distinguished by their Super Duty-style grilles and head lamps; standard cab', 'The twelfth generation F-150 was introduced for the 2009 model year as an update of the Ford full-size truck platform. Similar to its predecessor, these trucks are distinguished by their Super Duty-style grilles and head lamps; standard cab models again have two-doors instead of four. The FlareSide bed was continued until 2010, dropped along with the manual gearbox; outside of Mexico, the Lincoln Mark LT was replaced by the F-150 Platinum. A new model for 2010 included the SVT Raptor, a dedicated off-road pickup.', 'The twelfth generation F-150 was introduced for the 2009 model year as an update of the Ford full-size truck platform.']}}]}]