Which Chinese stock exchange index fell 8.49% on 24 August 2015?

The Shanghai Composite fell 8.49% on 24 August 2015 during China's stock-market turbulence.

The Shanghai Composite Index tracks the performance of shares listed on the Shanghai Stock Exchange. On 24 August, often called “Black Monday” in China, it suffered one of its sharpest daily declines as investors worried about slowing economic growth, falling commodity prices, and the possibility that official support would not stabilize equities.

The sell-off followed a major rise in Chinese share prices earlier in 2015. Many retail investors had entered the market, and margin financing increased exposure to falling prices. Authorities responded with measures including restrictions on some sales, liquidity support, and investigations into trading activity.

The Shanghai Composite is distinct from the Shenzhen Component and Hong Kong's Hang Seng Index. Those indexes also moved during the episode, but the 8.49% figure specifically identifies the Shanghai Composite's decline on 24 August 2015.