What is Chang's annual income? Chairman of Zhonggong Hi-Tech

Chang: Male, Han nationality, 1973, 1 Born in party member, China, with no permanent residency abroad, Ph.D., researcher. He has served as an intern researcher, assistant researcher, associate researcher and researcher at the Institute of Highway Science of the Ministry of Transport; Full-time deputy director and deputy director of the National Road and Bridge Quality Supervision and Inspection Center (Highway Engineering Testing Center of the Ministry of Transport) and deputy director of the Transportation and Highway Engineering Research Center; Manager of Highway Division of Zhonglu Hi-Tech Transportation Technology Group Co., Ltd.; Chairman of Beijing Luxing Highway New Technology Co., Ltd.; Director, deputy general manager and general manager of zhonggong hi-tech maintenance technology co., ltd.