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Ho Motor Co. Ltd. reported the worst results for the month, with deliveries plunging 46.6% from year-ago to 12,407.
Sales of imported cars were somewhat stronger than those of domestically produced models, continuing a year-long trend.
Government statistics show a total of 21,000 imported cars were sold in the first four months of this year, down 10% from like-2005.
However, sales of some luxury models continued to buck the downward trend. Deliveries of the Mercedes-Benz S-Class jumped 45% from year-ago, while BMW 7-Series sales rose 14%.