BEIJING — China's courier sector witnessed an expansion in July, the industry's monthly index showed.

The China express delivery development index stood at 316.2 in July, up 11.1 percent year-on-year, the State Post Bureau said.

The subindex for development scale stood at 343.8, up 26.2 percent year-on- year, while the subindex for service quality stood at 483.3, up 5.6 percent year- on-year.

The express delivery volume is expected to grow 28 percent in August, forecast the bureau.

Compiled on the basis of data from major logistics firms' operating delivery services, the development index reflects the overall business activities and trends in the country's courier sector.