Percentages are used to compare the segments which are ordered from biggest to smallest. 

原级是：from big to small （都是形容词）

from ...to ... 这个介词搭配，表示“范围”、“反义对比”、“成双成对”，不仅可以接名词，还可以接其他词性的词语，为了简练和顺口，都可以省略冠词：

from morning to night

from head to foot

from young to old

from slow to fast

from top to bottom

......