千分率

例句：

1. 1. The sales rate of this product has increased by 20% compared to last year.
   与去年相比，该产品的销售额提高了20%。
2. 2. The cost per unit has decreased by 10% since the beginning of the year.
   自年初以来，每单位的成本已经降低了10%。
3. 3. The efficiency of the production process has improved by 5% over the past year.
   过去一年中，生产过程的效率提高了5%。