In what year did China build the largest social security system in the world?

During the 13th Five-Year Plan period, China has built the largest social security system in the world.

During the "Thirteenth Five-Year Plan" period, China's social security system was gradually improved, the coverage was continuously expanded, the level of security was steadily improved, and the management services were optimized and standardized, and the largest social security system in the world was built, which effectively enhanced the people's sense of acquisition, happiness and security.