Question: when did the first kitchenaid mixer come out
[{'answer': '1918', 'provenance': [{'wikipedia_id': '3481492', 'title': 'KitchenAid', 'start_paragraph_id': 4, 'start_character': 91, 'end_paragraph_id': 4, 'end_character': 95, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '3481492', 'title': 'KitchenAid', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 469, 'bleu_score': 0.588885812649067, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2805130494721734906}, 'section': 'Section::::History.\n'}]}]