BEIJING - China's fixed-asset investment grew 11.2 percent year on year to 28.85 trillion yuan ($4.5 trillion) in the first 7 months of 2015, official data showed.

The growth retreated from 11.4 percent registered in the first half and much lower than 17 percent in the corresponding period of last year, the National Bureau of Statistics (NBS) said on Wednesday.

The calculation does not include fixed-asset investment by farmers. It includes projects with investment of at least 5 million yuan, as well as all property development projects.

Fixed-asset investment in secondary industries, which received the most investment, increased 9 percent from a year ago, while that in infrastructure jumped 18.2 percent. The smallest, agricultural investment, was up by 28.2 percent.

Wang Baobin, an NBS statistician, said the investment growth remained stable and the structure continued to improve.

Investment in high-tech sectors and industrial technological upgrades expanded 16.4 percent and 12.9 percent year on year respectively, while investment growth in 6 sectors with the highest energy costs slowed to 6.3 percent from 7.5 percent in the first half.

In addition, investment in consumer goods remained robust and infrastructure construction saw vigorous involvement of private capital.