-81.53% is the change from 639 to 118
Calculation steps:
[( 118 - 639 ) ÷ 639] x 100 = -81.53%
Formula
Percentage change = [(118 - 639) / 639] x 100
Subtract the new number by the original number
118 - 639 = -521
-521 ÷ 639 = -0.8153364632237872
-0.8153364632237872 x 100 = -81.53%