Question: when did the bmw 1 series change shape
[{'answer': '2013', 'provenance': [{'wikipedia_id': '26428463', 'title': 'BMW 1 Series', 'start_paragraph_id': 2, 'start_character': 126, 'end_paragraph_id': 2, 'end_character': 130, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '26428463', 'title': 'BMW 1 Series', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 330, 'bleu_score': 0.962600167205617, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9748217296889612157}, 'section': 'Section::::Abstract.'}]}]