Question: when did air conditioning became common in cars
[{'answer': '1969', 'provenance': [{'wikipedia_id': '33916504', 'title': 'Automobile air conditioning', 'start_paragraph_id': 22, 'start_character': 571, 'end_paragraph_id': 22, 'end_character': 575, 'bleu_score': 1.0, 'section': 'Section::::History.:Growth in demand.\n'}]}, {'provenance': [{'wikipedia_id': '33916504', 'title': 'Automobile air conditioning', 'start_paragraph_id': 22, 'start_character': 0, 'end_paragraph_id': 22, 'end_character': 741, 'bleu_score': 0.984062469849008, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10199334855974171744}, 'section': 'Section::::History.:Growth in demand.\n'}]}]