Wastage

noun

1. The amount or proportion of something that is wasted or lost by deterioration or other natural process.

   "The average wastage is 1.5% in the grocery department."

2. The periodical turnover of personnel in an organisation by death, retirement or resignation, as perceived by those aspiring to promotion or appointment in the organisation.
3. Anything lost by wear or waste.
4. Goods that are damaged, out of date, reduced, or generally unsaleable, which are destined to be thrown away and which are written off as a loss.
5. The act of abandoning animal carcasses or parts, usually illegal.