turnover

turnover n.

1 [C, usually sing., U] turnover (of sth) the total amount of goods or services sold by a company during a particular period of time: Umsatzturnover (of sb) the rate at which employees leave a company and are replaced by other people: Personalwechsel3[sing.] turnover (of sth) the rate at which goods are sold in a shop / store and replaced by others

Fluktuation

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an annual turnover of $75 million
a fall in turnover; a high turnover of staff; :a fast turnover of stock