What year does social security start?

Hi... Social security is from 1986, oh. 1. social security, the state from 1986 onwards, at that time is only for state-owned enterprise unit workers, the trial contract system, all after October 1986 to participate in the work of the contract system, and pay the pension insurance. 2. from 1993 onwards, the state has been to the state-owned enterprises of the whole population of the fixed workers, the trial of the full labor contract system, and then in all parts of the promotion. Gradually increase the coverage, and also gradually began the flexible employment pension insurance, in the face of the general public, in 1997 began to pilot the rural pension insurance and urban residents pension insurance Oh.