When did the regular employees of Lan Shu Mining Bureau start to pay social security?

The formal employees of Lan Shu Mining Bureau pay social security according to the calculated length of service.

If a regular worker starts to pay social endowment insurance after the 1992 enterprise implements the full-staff contract system, it shall be jointly borne by the employees and the enterprise. Fixed employees 1992 If they pay social endowment insurance before the full contract system is implemented, the working years shall be regarded as the payment years, and the payment years shall be calculated continuously.