BEIJING, June 3 (Xinhua) -- China's national economic development zones reported steady trade growth in 2017, according to the Ministry of Commerce.

The trade volume of the 219 national economic development zones reached 5.6 trillion yuan (875 billion U.S. dollars) last year, up 17.5 percent year on year, according to MOC spokesperson Gao Feng.

Exports stood at 3.2 trillion yuan last year, up 17 percent year on year and 6.2 percentage points higher than the national average growth.

Exports of high-tech goods hit 1.1 trillion yuan, up 11.5 percent year on year.

Imports reached 2.4 trillion yuan in 2017, up 18 percent year on year, which is slightly lower than the national growth on average.