index percent

例句：

1. 1. The index of the stock market has been rising steadily.
   股市的指数一直在稳步上升。
2. 2. The percentage of students who failed the exam was less than 5%.
   考试不及格的学生比例不到5%。
3. 3. The sales data shows that the index percent is increasing year by year.
   销售数据显示，指数逐年增加。