EV6 electric vehicles are assembled at Kia's AutoLand plant in Hwaseong in this photo provided by the company, May 18. Courtesy of Hyundai Motor Group

Hyundai Motor Co. and Kia Corp. saw the total sales of their eco-friendly cars exceed 3 million, industry data showed Sunday, 13 years after they began rolling out hybrid vehicles.

South Korea's top automaker and its affiliate sold 393,509 eco-friendly cars, including plug-in hybrid and all-electric vehicles, in the January to May period of this year, raising their accumulative sales to 3.01 million, according to the data.

Demand for eco-friendly cars remained solid despite global supply chain disruptions and a shortage of auto chips.

Hyundai and Kia reported a 5.9 percent year-on-year fall in auto sales to 2.69 million in the first five months of this year.

But their sales of eco-friendly cars jumped 42.6 percent to 393,509 in the cited period. (Yonhap)