Chinese markets clocked their best week in almost 16 years as the mainland’s CSI 300 rallied 15.7% this week, buoyed by several economic stimulus measures by the central bank.

The increases pulled the mainland Chinese CSI 300 index into positive territory for the year and have sent Hong Kong stocks rocketing 21 percent higher in 2024. Those are big turnarounds for markets that have been lagging those in other parts of Asia and the United States for well over a year.

China’s problems run deep, but policymakers are changing their tone. Experts are taking note but are still wary as previous moves haven’t worked.