These numbers are manipulated! The main aim of the communist party is to maintain a great image of China infront of the world. But the reality is very different that what you are seeing here.

A good read: https://www.cfr.org/article/chinas-homegrown-crisis

I personally work with 17 Chinese colleagues who are doing the same job since last 18 years without changing the company and with only one promotion. They are afraid of changing jobs as there's not much opportunities available outside the metro cities and it's extremely costly to live in metro cities. Do not believe things coming out of China glorifying themselves.