Examples
xué sheng学生rén shù人数yì一nián年bǐ比yì一nián年zēng jiā增加。
学生人数一年比一年增加。
The number of students grows year by year.
出国的人数一直在增加。
The number of people who go abroad has been increasing.
在电脑上玩电玩游戏的人数正在增加。
The number of people who play video games on PC is increasing.