-37.25% is the change from 639 to 401
Calculation steps:
[( 401 - 639 ) ÷ 639] x 100 = -37.25%
Formula
Percentage change = [(401 - 639) / 639] x 100
Subtract the new number by the original number
401 - 639 = -238
-238 ÷ 639 = -0.37245696400625977
-0.37245696400625977 x 100 = -37.25%