In Jiangsu Yancheng, if the social security base is 18,200 yuan, the individual's deduction amount is calculated based on different insurance types and their respective contribution ratios. Overall, the individual's total deduction is approximately 1,992 yuan. Here's a breakdown by insurance type:

1. Endowment Insurance: The individual contribution ratio is 8%. So for a base of 18,200 yuan, the deduction is ​
   ×8%=
   yuan.

2. Medical Insurance: The individual contribution ratio is 2%. Thus, the deduction is ​
   ×2%=
   yuan.

3. Unemployment Insurance: The individual contribution ratio is 0.5%. So the deduction is ​
   ×0.5%=
   yuan.

4. Work - related Injury Insurance and Maternity Insurance: Individuals do not contribute to these two types of insurance.

In summary, when the social security base in Yancheng, Jiangsu is 18,200 yuan, the individual's total social security deduction is mainly from endowment, medical, and unemployment insurances, amounting to approximately 1,992 yuan. It should be noted that social security policies may be adjusted, so it is recommended to follow the latest local regulations.