-24.88% is the change from 639 to 480
Calculation steps:
[( 480 - 639 ) ÷ 639] x 100 = -24.88%
Formula
Percentage change = [(480 - 639) / 639] x 100
Subtract the new number by the original number
480 - 639 = -159
-159 ÷ 639 = -0.24882629107981222
-0.24882629107981222 x 100 = -24.88%