Annual loss and damage analysis for Hotels

Hello all, for better inventory and budget control hotels need to keep track of lost and damaged products. Staff can count products (glassware, porcelain, flatware, linen etc.) monthly and state current condition with loss and damaged numbers. But in order to see how we are at the end of the year, i think we need to compare some numbers with references numbers. For example, if the acceptable damage percentage for the glass group is 12-15% and mine is 20% i can say that i am doing something wrong.

Are there reference/common/global percentages or a study / analysis on the subject?

Thanks.

Where can I find the videos?