SEOUL, Jan. 25 (Xinhua) -- Hyundai Motor, South Korea's biggest automaker, posted the lowest operating profit in seven years in 2017, the company said Thursday.

Consolidated operating profit was 4.57 trillion won (4.31 billion U.S. dollars) in 2017, down 11.9 percent from a year earlier. It marked the lowest since 2010 when the profit reached 5.92 trillion won.

Hyundai's revenue rose 2.9 percent over the year to 96.38 trillion won (90.87 billion U.S. dollars) in 2017.

The ratio of operating profit to revenue stood at 4.7 percent in 2017, down 0.8 percentage points from the previous year. It was the lowest in seven years.

Net income tumbled 20.5 percent to 4.55 trillion won (4.29 billion U.S. dollars) in 2017.

During the October-December quarter, Hyundai's revenue amounted to 24.5 trillion won (23.1 billion U.S. dollars), slightly down 0.2 percent from the same period a year ago.

Operating profit plunged 24.1 percent over the year to 775.2 billion won (731 million U.S. dollars) in the December quarter.

The ratio of operating profit to revenue dipped to 3.2 percent in the fourth quarter, falling below 4 percent in seven years.