BEIJING — China’s fixed-asset investment has maintained rapid growth since the country began to implement the reform and opening-up policy in 1978 and has been an important force behind China’s economic growth, official data showed Sept 6.

Between 1981 and 2017, fixed-asset investment totaled 490 trillion yuan ($71.83 trillion), with an average annual growth rate of 20.2 percent, the National Bureau of Statistics (NBS) said on its website.

The contribution of investment to China’s economic development also stayed at a high level, with the share of investment in GDP up from 38.9 percent in 1978 to 44.4 percent in 2017.

The share peaked in 2011 at 48 percent and fell after that as China’s economy steered away from over-reliance on investment and exports to the coordinated driving forces of consumption, investment, and export.

Last year, the share of investment in GDP was 9.2 percentage points lower than that of final consumption and the contribution of investment to economic growth stood at 32.1 percent, 26.7 percentage points lower than final consumption.

China has gradually created sound interaction between effective investment and consumption upgrading, the NBS said.

Calculated with constant prices, China’s GDP rose 33.5 times in the 1978-2017 period, representing an average annual growth of 9.5 percent, much higher than a world average of about 2.9 percent during the same period.