What is the appropriate proportion of logistics personnel to the total number of people in the company?

The company has more than 6,000 employees and 5 business divisions, all of which have business/technology/quality assurance/production level. Logistics is divided into personnel/administration/general affairs (including security guards, canteens, motorcades, cleaners, etc. ). At present, the ratio of logistics personnel to company employees is 1:9, which is considered too high, but it lacks basis. (temporarily unable to do job analysis, etc. ), ask prawn, what is the reasonable proportion of logistics personnel (indirect personnel)? Can you share the proportion of people in your company? Thank you!