For example, it is estimated that SAS turnover rate is 4 percent compared to the industry norm of more than 20 percent per year.

例如，据估计，赛仕软件研究所的员工流失率为每年4%，而同行业的员工流失率一般高达20%。

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Such calculations are more art than science: one exercise by the European Central Bank estimated China's norm 16, 384 different ways.

ECONOMIST: Exports