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In which year did Jilin Province unify the social security payment base?

Jilin Province began to unify the social security payment base from 200 1. 200 1 the minimum social security base is 355 yuan, and the average base is 592; In 2002, the minimum social security base was 402 yuan, with an average base of 670; In 2003, the minimum social security base was 455 yuan, with an average base of 758; In 2004, the minimum social security base was 495 yuan, and the average base was 825.