The following is a tree map of auto market sales volumes in August 2018, with percentages showing year-over-year growth rates. Please answer the questions based on the tree map: 总销量——total sales volumes 轿车——Sedans 德系—— German series 日系—— Japanese series 美系—— American series 法系—— France series 自主—— Domestic 韩系—— South Korean series Based on the year-over-year growth rates of the various metrics in the tree map, the vehicle type that had the greatest influence on total sales growth was: