When did the social security issue begin to be implemented? What are the rules?

Hello, the year when the social security issue was implemented is clearly recorded in our country. In 1980s, in order to meet the needs of economic system reform, China began to reform the urban endowment insurance system. After years of exploration in 10, the mixed endowment insurance model characterized by the combination of social pooling and individual accounts was formally established in 1997. In this model, the social pooling part is 20% of the total wages of enterprise employees, which is formed by enterprise contributions, and the personal account part is 10 of individual contributions. Therefore, the old-age insurance started from 1997, and then gradually increased medical, unemployment, disability and family planning insurance, referred to as "five insurances".