Question: when did air conditioning became standard in cars
[{'answer': 'late twentieth century', 'provenance': [{'wikipedia_id': '33916504', 'title': 'Automobile air conditioning', 'start_paragraph_id': 21, 'start_character': 61, 'end_paragraph_id': 21, 'end_character': 83, 'bleu_score': 1.0, 'section': 'Section::::History.:Growth in demand.\n'}]}, {'provenance': [{'wikipedia_id': '33916504', 'title': 'Automobile air conditioning', 'start_paragraph_id': 21, 'start_character': 0, 'end_paragraph_id': 21, 'end_character': 670, 'bleu_score': 0.9822204502117851, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16514746127063619987}, 'section': 'Section::::History.:Growth in demand.\n'}]}]