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The heights of \(20\) students in a class recorded in \(cm\) are given below. Find out the mode of their heights?
 
169.5, 152.1161.7, 156.5146.9, 152.1, 156.5, 161.7, 169.5, 152.1, 146.9, 156.5, 161.7, 169.5, 152.1, 146.9, 161.7, 156.5, 169.5, 152.1
 
The mode of the students' heights \(=\) .