percentile

1. N-COUNT A percentile is one of the equal divisions of an amount, expressed on a scale from 0 to 100. The 90th percentile of an amount is all amounts between zero percent and ninety percent. 百分位数[usu with supp]

She says blacks who identify with the Democratic Party have fallen from the 90th percentile down to around 70 percent. 她说黑人中支持民主党的人数比例从百分之九十下降到大约百分之七十。