Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
The 1990 Chinese census, officially the Fourth National Population Census of the People's Republic of China, was conducted by the National Bureau of Statistics of the People's Republic of China. Based on the fourth census of July 1990, mainland China's population was estimated to be 1.133 billion. According to the 1990 census, there were 56 ethnic nationalities with a total population of 1,133 billion. Among them, the Han Chinese had a population of 1.042 billion (94% of overall population).
"第四次全国人口普查公报(第1号)". National Bureau of Statistics of China (in Simplified Chinese). 2001-11-02. Archived from the original on 2021-05-07. Retrieved 2021-05-07.
"第四次全国人口普查公报(第2号)". National Bureau of Statistics of China (in Simplified Chinese). 2001-11-02. Archived from the original on 2021-05-16. Retrieved 2021-05-16.
"第四次全国人口普查公报(第3号)". National Bureau of Statistics of China (in Simplified Chinese). 2001-11-02. Archived from the original on 2021-05-16. Retrieved 2021-05-16.
"第四次全国人口普查公报(第4号)". National Bureau of Statistics of China (in Simplified Chinese). 2001-11-02. Archived from the original on 2021-05-16. Retrieved 2021-05-16.
"第四次全国人口普查公报(第5号)". National Bureau of Statistics of China (in Simplified Chinese). 2001-11-02. Archived from the original on 2021-05-16. Retrieved 2021-05-16.